List of Impurity

API NamePharmaCopoeiaImpuritiesIUPAC Name
Acyclovir BPGuanine (Imp B) 2-amino-1,7- dihydro-6H- purin-6-one 
Adapalene INH a) Brom- onapthoic acid 
Adapalene INH b) methyl- 6-bromo-2- naphthoate 
Adapalene INH c) 2-(1-adam- antyl)-anisole 
Adapalene INH d) Anisole-2- (1-adamantyl) -4-bromo 
Adapalene INH e) methylester of adapelene 
Adapalene INH f) 3,3-diada- mantyl- 4,4� - dimethoxy biphenyl 
AlprazolamINH Triaz- olam 
Amlodipine Besilate BP Amlod- ipine Imp D 3-ethyl-5-ethyl -2-[(2-amino- ethoxymethyl] -4-(2-chloro- phenyl)-6- meth-ylpyridine -3,5-dicarbo- xylate 
Amlodipine Mesylate BP Amlod- ipine Imp D 3-ethyl 5-methyl- 2-[(2-amino- ethoxymethyl] -4-(2-chloro- phenyl)-6-met- hylpyri-dine -3,5-dicarb- oxylate 
AmoxycillinBPa) imp D a) Sodiumsalt of amox- icilloic acid 
AmoxycillinBPb) imp. C b) Diketo piper- azineamox- ycillin 
BPa) imp D a) Sodium salt of ampiclloic- acid 
Ampicillin BPb) imp. C b) Diketop- iperazine of ampicillin 
Amplodipine Maleate BPAmlod- ipine Imp D 3-ethyl 5- methyl-2- [(2-amino- ethoxymethyl] -4-(2-chlor- ophenyl) -6-methy- lpyridine- 3,5-dicarb- oxylate 
Anagrelide HCL INH a) Methyl-5-6- dichloro-3,4- dihydro 2[1H] iminoquin- azolin-3- acetate 
Anagrelide HCL INH b) Ethyl-5,6- dichloro3,4- dihydro2[1H] iminoquin- azolin-3- acetatehydro- bromide 
Anagrelide HCL INH c) 6,7,8- trichloro 1,5-dihydro imidazo (2,1-b) quinazolin-2 (3H)-one 
Anagrelide HCL INH d) 5,6-dichloro 3,4-dihydro -amino quinazolin -3-aceticacid 
Anagrelide HCL INH e) 5,6-dichloro 3,4-dihydro 2[1H]imino quinazolin 
AnastrozoleINH a) a,a,a',a'- Tetramethyl- 5(1H-1,3,4- triazol-1-yl- methyl)-1,3- benzene-diacet- onitrile 
AnastrozoleINH b) 2,2'-(5- methyl-1,3- phenylene) -di-(2-methyl propiononitrile) 
AnastrozoleINH c) 3,5-bis (cyano-1- methylethyl benzylbr- omide) 
Artemether INH a)Dihydro- artemisinin 
Artemether INH b) Alpha- Artemether (Oil cointa- ining30% impurity) 
ArtesunateINH Dihydro- artemisinin 
Beclometh- asone Dipropionate BP a) imp J a) 9,11b- epoxy-16b- methyl-3,20- dioxo-9b- regna-1,4- diene-17,21- diyl dipropanoate, 
Beclometh- asone Dipropionate BP b) imp H b) 9-chloro- 11b,21-dihy- droxy-16b- methyl-3,20- dioxopregna- 1,4-dien-17- yl propanoate (beclometa- sone 17-propi- onate), 
Beclometh- asone Dipropionate BP c) imp G c) 9-chloro- 11b,17,21-trihy- droxy-16b- methyl- pregna-1,4- diene-3,20- dione(becl- ometasone), 
Beclometh- asone Dipropionate BP d) imp D d) 9-bromo- 11b-hydroxy -16b-methyl- 3,20-diox- opregna -1, 4-diene- 17,21-diyl- dipro-panoate, 
Beclometh- asone Dipropionate BP e) imp A e) 9-chloro- 11b,17-dihy- droxy-16b- methyl-3,20- dioxopregna- 1, 4-dien- 21-yl prop- anoate (becl- ometasone 21-propionate), 
Beclometh- asone Dipropionate BP f) imp B f) 21-(acetyl- oxy)-9-chloro- 11b-hydro- xy-16b-methyl- 3,20-dioxo- pregna-1, 4-dien-17-yl propa-noate (beclometa- sone-21- acetate 17- propionate), 
Beclometh- asone Dipropionate INH g)Beclo- metha- sone 21- butyrate g) 9-chloro- 11b,17-dihydr- oxy-16b-methyl- 3,20-dioxopre- gna-1,4-dien- 21-yl buta- noate 
BicalutamideINH a) (±)N-[4-cya- no-3(triflu- oro-methyl) phenyl]-3[(4-flu- oro phenyl) thio]-2 hyd- roxy-2-methyl- propanamide 
BicalutamideINH b) (±)N-[2- cyano-3(triflu- oromethyl) phenyl]-3[(4- fluorophenyl) sulfinyl]-2- hydroxy-2- methylpropa- namide 
BicalutamideINH c) (±)N-[4- cyano-3(trif- luoromethyl) phenyl]-3 [(4-fluoro phenyl)sulfinyl] -2-hydroxy-2- methylpropa- namide 
Brimonidine Tartarate INH a) 5-Bromo, 6-amino quinaxaline 
Brimonidine Tartarate INH b) 6-amino quina-xaline 
Budesonide BP a) 16a,17-(1RS)- butylidenebis (oxy)]-11b- hydroxy-3,20- dioxopregna- 1,4-dien-21-al, 
Budesonide BP b) 11b,16a,17, 21-tetra- hydroxypregna -1,4-diene-3, 20-dione, 
Budesonide BP c) 16a,17-[1- methylethyli- denebis(oxy)] -11b,21-dihydr- oxypregna-1, 4-diene-3,20- dione, 
Budesonide INH d) 11b,17,21- tetrahydrox- ypregna-1, 4-diene-3,20- dione 
Budesonide INH e) Acetaldehyde 
Capace- tabine INH a) 2�3�-dioacetyl- 5�deoxy-5 fluor- ocytidine 
Capace- tabine INH b) 4�-bromom- ethyl-5�-deoxy- 5 fluoro-N-[(pen- tyloxy)carboxyl] cytidine 
Capace- tabine INH c) 2�3�-diocetyl -5�-deoxy-5 fluoro N-[(pent- yloxy)carbonyl] cytidine 
Capace- tabine INH d) 5'-deoxy-5- fluorocytidine 
Captopril BP Imp A (2S,2¢S)-1,1¢- [disulphaned- iylbis[(2S)-2- methyl-1-oxop- ropane-3, 1-diyl]-bis [pyrro-lidine- 2-carb-oxylic] acid(captopril -disulphide). 
CarboplatinINH Cisiod- oplatin 
CarboplatinBP Imp B cyclobutane-1, 1-dicarboxylic acid 
Carvedilol BP a) Imp B a) 1,1¢-[[2-(2- methoxyph- enoxy)ethyl] nitrilo]bis[3- (9H-carbazol -4-yloxy) propan-2-ol], 
Carvedilol INH b) Epoxy- Carbazole 
Carvedilol BP c) Imp A c) 1-[[9-[2- hydroxy-3- [[2-(2-metho- xyphenoxy) ethyl]amino] propyl]-9H- carbazol-4-yl] oxy]-3-[[2- (2-methox- yphenoxy) ethyl]amino] propan-2-ol, 
Carvedilol INH d) 1-propanol Carbazole 
Carvedilol INH e) C V Side Chain 
Carvedilol INH f) AEP Compound 
Carvedilol INH g) Carvedilol polymorph Form-I 
Carvedilol BP h) Imp C h) (2RS)-1- [benzyl[2- (2-methoxy- phenoxy) ethyl]amino]-3- (9H-carbazol -4-yloxy) propan-2-ol
Carvedilol INH i) 4-hydroxy Carbazole 
Celecoxib INH CX-I Compound 
Celecoxib INH HSA compound 
Ciclesonide INH a) Ciclesonides- isomer(11P, 16?)-16,17[[(S)- cyclohexy- lmethylene] bis(oxy)]-11- hydroxy-21-(2 methyl-1- oxopropoxy) pregna-1,4- diene,3,20- dione 
Ciclesonide INH b) Propyla- nalogue 
Ciclesonide INH c) 16-? hydroxyl prednisolone 
Ciclesonide INH d) n- butyryl derivative 
Ciclesonide INH e) Isobytyryl derivative 
Ciclesonide INH f) Cyclohexyl derivative 
Ciclesonide INH g) Benzyl derivative 
CitalopramINH a) Citalopram Impurity 'B' 
CitalopramINH b) Citalopram Impurity 'D' 
CitalopramINH c) Citalopram Impurity 'A' 
CitalopramINH c) Citalopram Impurity 'A' 
CitalopramINH d) Citalopram Impurity 'C' 
CitalopramINH e) Des-bromo Citalopram Impurity 
CitalopramINH f) 5-chloro pthalide 
Clarithro mycin INH a) Clarithr- omycin N-oxide 
Clarithro mycin EP b) Imp D b) N-Desmethyl clarithromycin 
Clarithro mycin INH c) N-Desmethyl Erythromycin A 
Clarithro mycin EP d) Imp H d) N-Formyl Clarithromycin 
ClonazepamBP Imp A a) 2-Amino2-�- Chloro- 5-Nitrobenzo- phenone 
ClonazepamUSP Related comp- ound 'B' a) 2-Amino2-�- Chloro- 5-Nitrobenzo- phenone 
Clopidogrel bisulphate INH a) Racemate impurity of Clopidogrel 
Clopidogrel bisulphate INH b) Acid Impurity of CLP 
DesloratidineINH a) N-formyl Desloratidine 
DesloratidineINH b) Loratidine 
DiazepamUSP Related comp- ound 'B' 3-Amino-6- chloro-1- methyl-4- phenylcarbostyril 
Didanosine INH Hypox- anthine Imp A 1,7-dihydro- 6H-purin-6- one(hypox anthine) 
Didanosine INH Inosine- Imp B 9-b-D-ribofur- anosyl-1,9- dihydro-6H- purin-6- one(inosine) 
Didanosine INH 2',3'-dideoxy- 2',3'-didehydro inosine sodium 
Donepezil HCL INH a) 4-[(5,6- Dimethoxy- 1-indanon -2-yl)methylene] pyridine 
Donepezil HCL INH b) 1-Benzyl- 4-[(5,6- dimethoxy- 1-indanon-2- yl)methylene] pyridine bromide 
Donepezil HCL INH c) 2-(4-Piperidinyl- methyl)-5,6- dimethoxy-1- indanone 
Donepezil HCL INH d) 1-Benzyl-4 -[5,6-dimethoxy- 1-oxoindan]methyl pyridine 
Duloxetine Hydrochloride INH DLX - Racemic mixture (±)-N-Methyl-3- (1-napthalenyloxy)- 3-(2-thienyl) propana- minoxalate 
EmtricifabineINH a) Emtricifabine Carboxylic acid impurity 
EmtricifabineINH b) Isomer impurity of Emtricifabine 
EmtricifabineINH c) 4-Amino, 6fluoro 1- [(2R,5S)-2 (hydroxy- methyl)- 1,3 oxathiolan- 5-yl}-2(1H) pyrimidinone 
EmtricifabineINH d) Emtricitabine hydroxy Impurity 
EmtricifabineINH e) Emtricitabine sulfoxide Impurity 
Es- omeprazo- le magnesium dihydrate INH Sulphide impurity 5-Methoxy-2 -(4-methoxy -3,5-dimethylp- yridin-2-yl- methylthio) 1H-benzi- midazole 
Es- omeprazo- le magnesium dihydrate INH N-oxide impurity 5-Methoxy-2 -[[(4-methoxy -3,5-dimethylp- yridin-2-yl) methyl] sulphinyl]- 1H-benzimidazole- 1'-oxide 
Es- omeprazo- le magnesium dihydrate INH Sulphon eimpurity 5-Methoxy- 2-[[(4-meth- oxy-3, 5-dimethylp- yridine-2-yl) methyl] sulphonyl]-1H- benzimidazole 
Es- omeprazo- le magnesium dihydrate INH Desm- ethoxy impurity 5-Methoxy-2 -[[(3,5-dimethyl- pyridine-2-yl] methyl] sulphinyl]- 1H-benzi- midazole 
Es- omeprazo- le magnesium dihydrate INH Omep- razole sulphone 5-methoxy-2 -[[(4-methoxy -3,5-dimethylpy- ridine-2-yl) methyl] sulphonyl]- 1H-benzimi- dazole 
Es- omeprazo- le magnesium dihydrate INH Ome- prazole sulphide 5-methoxy-2 -(4-methoxy -3,5-dimethylp- yridin-2-yl- methylthio) 1H-benzi midazole 
Es- omeprazo- le magnesium dihydrate INH Omep- razole N-oxide 5-methoxy-2- [[(4-methoxy-3, 5-dimethyl- pyridin-2-yl) methyl] sulphinyl]- 1H-benzimi- dazole-1'- oxide 
EstramustineINH a) Estramustine 
EstramustineINH b) 17-b phosphate estradiol 
EtoposideINH (5R,5aR,8aR,9S) -9-(b-D-glucopy- ranosyloxy)- 5-(4-hydroxy- 3,5-dimetho- xyphenyl) -5,8,8a,9- tetrahy- droisobenzofuro [5,6-f][1,3] benzodioxol-6 (5aH)-one (lignan P) 
EtoposideINH 4� de methyl epipodoph- yllotoxin 
EtoposideINH (5R,5aR,8aR,9S) -9-[[4,6-O-[(R)- ethylidene]-a-D- glucopyranosyl] oxy]-5- (4-hydroxy- 3, 5-dimethoxy- phenyl)-5,8,8a,9- tetrahydroisoben- zofuro[5,6-f] [1,3]benzo- dioxol-6(5aH)- one(a-etop- oside) 
EtoposideINH (5R,5aS,8aR,9S) -9-[[4,6-O-[(R)- ethylidene] -b-D-glucopy- ranosyl]oxy]-5- (4-hydroxy- 3,5- dimethoxyp- henyl)-5,8,8a,9- tetrahydroiso- benzofuro [5,6-f][1,3] benzodioxol- 6(5aH)-one (picroethylidene- lignan P;cis- etoposide) 
EtoposideINH 4�-O-Carbob- enzyloxy 4�-demethyl epipodop- hyllotoxin 
EtoposideINH (5R,5aR,8aR,9S) -5-[4-[[(benz- yloxy)carbonyl] oxy]-3,5- dimethoxy- phenyl]- 9-[[4,6-O-[(R)- ethylidene]-b- D-glucopyran- osyl]oxy]-5,8, 8a,9-tetrahy- droisobenzofuro [5,6-f][1,3] benzodioxol- 6(5aH)- one(4¢-carbo- benzoyloxy- ethyliden 
EtoposideINH (5R,5aR,8aR,9S) -9-[[4,6-O-[(R)- ethylidene] -b-D-glucopy- ranosyl]oxy]-5- (3,4,5-trimetho- xyphenyl)-5, 8,8a,9- tetrahydrois- obenzofuro [5,6-f][1,3] benzodioxol -6(5aH)-one (4-O-methylethy- lidenelignan P) 
FamciclovirINH a) Famciclovir Impurity-1 
FamciclovirINH b) Famciclovir Impurity-2 
FamciclovirINH c) Des acetyl famciclovir 
FamotidineBP a) Imp C a) 3-[[[2- [(diamino- methylene) amino]thiazol -4-yl]methyl] sulphanyl]-N -sulphamoyl- propanamide, 
FamotidineBP b) Imp D b) 3-[[[2- [(diamino- methylene) amino]thiazol -4-yl]methyl] sulphanyl] propanamide, 
FamotidineBP c) Imp F c) 3-[[[2- [(diamino- methylene) amino]thia- zol-4-yl] methyl] sulphanyl] propanoic acid, 
Felodipine BPimp A Ethylmethyl 4- (2,3-dichlor- ophenyl)-2,6- dimethylpyridine- 3,5-dicarboxylate 
Felodipine BP Imp B Dimethyl 4-(2,3- dichlorophenyl) -2,6-dimethyl -1,4-dihydro- pyridine-3,5- dicarboxylate 
Felodipine BP Imp C Diethyl 4- (2,3- dichlorophenyl) -2,6-dimethyl -1,4-dihydro- pyridine -3,5-dicarb- oxylate 
Felodipine USP Related comp- ound A Ethylmethyl 4- (2,3-dichlo- rophenyl) -2,6-dimeth- ylpyridine-3, 5-dicarboxylate 
Fenoteral Hydro bromide BP a) Imp A a) (1RS)-1-(3,5- dihydoxyphenyl) -2-[[(1SR)-2 -(4-hydroxy- phenyl)- 1-methylethyl] amino]ethanol, 
FluconazoleINHa) Fluconazole Form-I 
Flutamide BP imp A 4-Nitro-3- trifluorom- ethylaniline 
Flutamide BP Imp D 3-trifluoromethyl- aniline 
Flutamide INH3-trifluorom- ethylisobu- tyranilide 
Flutamide INHortho flutamide 
Fluticasone propionate BP a) Imp A a)6a,9-difluoro- 11b-hydroxy- 16a-methyl-3- oxo-17-(propano- yloxy)androsta-1, 4-diene-17b- carboxylic acid, 
Fluticasone propionate BP b) Imp F b) 6a,9- difluoro- 17-[[(fluoro- methyl) sulphanyl] carbonyl]- 16a-methyl-3, 11-dioxoan- drosta-1,4-dien- 17a-yl propanoate, 
Fluticasone propionate BP c) Imp H c) 17,17¢- (disulpha- nediyldica- rbonyl)bis(6a,9- difluoro- 11b-hydroxy- 16a-methyl- 3-oxoand- rosta-1, 4-dien-17 a-yl) dipro- panoate, 
Fluticasone propionate INHd) S-methyl Fluticasone propionate 
Fluticasone propionate INHe) Fluticasone base 
Fluticasone propionate INHf) Fluticasone acetate 
Fluticasone propionate INHg) Dimmer impurity of Fluticasone Propionate 
Fluticasone propionate INHh) Fluticasone Stage-V(iodo fluticasone) 
Fluticasone propionate INHi) Fluticasone Stage-III(thio propionate) 
FormoteralBP a) Imp A a) 1-(3- amino-4- hydroxyphenyl)-2- [[2-(4-methoxyp- henyl)-1-methyl- ethyl}amino} ethanol 
FormoteralBP b) Imp C b) N-[2-hydroxy-5 [1-hydroxy-2-[[2- (4-metho- xyphenyl- 1- methylethyl] amino]ethyl] phenyl]acetonide 
Gabapentin INH3,3-penta- methylene- 5-butyrol- actam 
Gatifloxacin sesquihydrate INHDesmethyl Gatifloxacin 
Gatifloxacin sesquihydrate INHGatifloxacin ester 
Gatifloxacin sesquihydrate INHGatifloxacin acid 
Granisetron Hydrochloride BP imp A 2-methyl- N-[(1R,3r, 5S)-9-methyl- 9-azabicy- clo[3.3.1] non-3-yl]- 2H-indazole- 3-carboxamide 
Granisetron Hydrochloride BP Imp B N-[(1R,3r,5S)- 9-methyl-9- azabicyclo [3.3.1]non- 3-yl]- 1H-indazole- 3-carboxamide 
Granisetron Hydrochloride BP Imp D 1-methyl- 1H-indazole- 3-carboxylic acid 
Granisetron Hydrochloride BP Imp E (1R,3r,5S)- 9-methyl- 9-azabicyclo [3.3.1] nonan-3-amine 
Imatinib mesylate INHa) N-(2-Methyl- 5-aminophenyl)- 4-(3-Pyridyl)- 2-Pyrimidine Amine. 
Imatinib mesylate INHb) 4-[(4- Methyl-1- Piperazinyl) methyl]-N- [4-methyl- 3-[4-(3- Pyridinyl)- 2-Pyrimidinyl] chlorom- ethyl-amino] phenyl] Benzamide. 
Irinotican Hydrochloride Trihydrate INHa) 7-ethyl camptothecin 
Irinotican Hydrochloride Trihydrate INHb) 10-hy- droxy-7- ethylcampto- thecin 
LamivudineINHa) 4-Amino- 1-(2-(hydroxy- methyl)1,3 oxath- iolan-5-yl}-2(1H) pyrimidinone 
LamivudineBP b) Imp A b) Carboxylic acidimpurity of Lamivudine 
LamivudineINHc) Salicylic acid 
LamivudineINHa) 2,3-dichloro- benzoylcyanide 
LamivudineINHb) 1-(1�cyano, 1-amino- guanidine), 2,3-dichlo- robenzene 
LansoprazoleINHPharm- europa Imp B 2-[[[3-methyl-4- (2,2,2-trifluoro- ethoxy)-2- pyridyl]-methyl] sulphonyl]- benzimidazole 
LansoprazoleINHLansop- razole Sulphide 2-[{[3-methyl- 4-(2,2,2-trifluoro ethoxy)-2- pyridinyl]- methyl} thio]-1H- benzimid- azole 
LansoprazoleINHLansop- razole N-oxide 2-[[[3-methyl-4- (2,2,2-trifluoro- ethoxy)-2- pyridinyl] methyl] sulphinyl-1H- benzimidazole- 1-oxide 
Leflunomide INHa) N- (4-trifluoro- methylphenyl)- 2-cyano- 3-hydroxy crotonamide 
Leflunomide INHb) 2-Ethoxy- methylene acetoacetic acid-4-trilfuorom- ethylanilide 
Leflunomide INHc) 5-Methy- lisoxazole- 4-carboxylic acid 
Leflunomide INHd) 3-Methyl- N-[4-trifluo- romethyl) phenyl]-4- isoxazole carboxamide 
Letrozole INHa) 4-fluor- obenzonitrile 
Letrozole INHb) (1H-1,2, 4-triazol-1- yl-methylene) 4-benzonitrile 
levofloxacine Hemihydrate INHa) (-)-(S)- 9-fluoro-2, 3-dihydro- 3-methyl-10- (1-piperazinyl)- 7-oxi-7H- pyrido [1,2,3-del]- 1,4-benzox- azine-6- carboxylic acid 
levofloxacine Hemihydrate INHb) Chloromethyl esterimpurity 
levofloxacine Hemihydrate INHc)N-Ethyl Levofloxacin impurity 
Losartan potassium INHa) LSR-I compound 
Losartan potassium INHb) TTBB 
Losartan potassium INHc) BCFI 
Losartan potassium INHd) Triphenyl methanol 
MebendazoleBP Imp A a) (2-Amino- 1H-benzoi- midazole- 5-yl)phenyl- methanone 
Mitoxantrone Hydrochloride INHLeuco 1, 4,5,8-tetrahy- droxy anthra- quinone 
Mometasone furoate INHa) Mometasone base 
Mometasone furoate INHb) Mometasone difuroate 
Mometasone furoate INHc) 21-hydroxy Mometasone Furoate 
Mometasone furoate INHd) mometasone furoate epoxide 
NevirapineBP a) Imp C a) 4-methyl- 11-propyl- 5,11-dihydro- 6H-dipyrido [3,2-b:2¢,3¢-e] [1,4]diazepin-6- one. 
NevirapineBP b) Imp A b) 11-ethyl -4-methyl- 5,11-dihydro- 6H-dipyrido [3,2-b: 2¢,3¢-e] [1,4]diaz- epin-6-one, 
Nifedipine BP a) Imp A a) dimethyl 2,6-dimethyl-4- (2-nitrophenyl) pyridine-3, 5-dicarbo- xylate (nitrophenylpy- ridine analogue), 
Nifedipine BP b) Imp B b) dimethyl 2,6-dimethyl-4- (2-nitroso- phenyl) pyridine-3,5- dicarb- oxylate (nitrosop- henylpyridine analogue), 
Nifedipine USP Nitrop- heny- lpyridine Analog Dimethyl 4-(2-nitrop- henyl)-2, 6-dimeth- ylpyridine- 3,5-dicarbo- xylate 
Nifedipine USP Nitros- opheny- lpyridine Analog Dimethyl 4-(2-nitro- sophenyl)- 2,6-dime- thylpyridine- 3,5-dicar- boxylate 
NorfloxacinINHa) N-5 Compound 
NorfloxacinINHb) N-7 Compound 
NorfloxacinINHc) Chloro analogue of Norfoxacin 
Ofloxacin BP imp A 9,10-difluoro-3- methyl-7- oxo-2,3- dihydro- 7H-pyrido [1,2,3-de]- 1,4-benzo xazine- 6-carboxylic acid 
Ofloxacin BP Imp E 9-Fluoro-3- methyl- 7-oxo-10- piperazin- 1-yl)-2,3- dihydro-7H- pyrido[1,2,3- de]-1,4- benzoxazine- 6-carboxylic acid 
Olanzapine INHa) Olanzapine ethyl analogue 
Olanzapine INHb) 4-hydroxy impurity of Olanzapine 
Olanzapine INHc) Olanzapine Form-II 
Olanzapine INHd) Olanzapine Form-I 
Olanzapine INHe) Des-N-Methyl Olanzapine 
Olanzapine INHf) ZP-I Compound 
Olanzapine INHg) ZP-II Compound 
Olanzapine INHh) ZP-III Compound 
Olmesartan RNH 62705-(1-Hydroxy-1-methylethyl)-2-propyl-3-[2’-(2H-tetzazol-5-yl) biphenyl-4-ylmethyl]-3H-imidazole-4-carbxylic acid
Olmesartan RNH 63634-isoprepenyl-2-propyl-1-[[[2’-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]lmidazole-5-carboxylic acid
Olmesartan RNH 63632-Butyl-5-isopropenyl-3-[2’-(2H-tetrazol-5-yl)biphenyl-4-ylmethyl]-3H-imidazole-4-carboxylic acid 5-methyl-2-oxo-[1,3]dioxol -4-ylmmethyl ester
Olmesartan RNH 82764-[l-[[[4-(1-hydroxy-1-methylethyl) -2-propyl-1-[[2’-(1H-tetrazol-5-yl) biphenyl-4-yl]methyl]imidazole-5-yl] carbonyl]oxy]-1-methylethyl]-2-propyl -1-[[2’-(1H-tetrazol-5-yl)biphenyl-4-yl] methyl]imidazole-5-carboxylic acid
Omeprazole BP imp A 5-methoxy- 1H-benzimi- dazole-2-thiol. 
Omeprazole Magnesium BP Imp B 2-[(RS)- [(3,5-dime- thylpyridin- 2-yl)methyl] sulphinyl] -5-methoxy -1H-benzi- midazole
Omeprazole Sodium BP Imp C 5-methoxy- 2-[[(4-met- hoxy-3,5- dimethylp- yridin-2-yl) methyl] sulphanyl] 1H- benz- imidazole. (ufiprazole) 
Omeprazole Sodium BP Imp D 5-methoxy- 2-[[(4-met- hoxy-3,5- dimethyl- pyridin-2-yl) methyl] sulphonyl]- 1H-benzim- idazole (omeprazole sulphone) 
Omeprazole Sodium BP Imp E 4-methoxy- 2-[[(RS)- (5-methoxy- 1H-benzim- idazol-2-yl)sulp- hinyl]methyl]-3, 5-dimethy- lpyridine 1-oxide 
Omeprazole Sodium INHB5 Hydro- chloride 2-hydrox- ymethyl 3, 5-dimethyl -4-methoxy pyridineh- ydrochloride
Ondansetron hcl BP a) Imp A a) (3RS)-3- [(dimethy- lamino) methyl]- 9-methyl- 1,2,3,9- tetrahydro- 4H-carbazol- 4-one, 
Ondansetron hcl BP b) Imp C b) 9- methyl- 1,2,3,9- tetrahydro- 4H-carba-zol- 4-one, 
Ondansetron hcl BP c) Imp D c) 9-methyl- 3-methylene- 1,2,3,9-tetrahy- dro-4H-carbazol- 4-one, 
Ondansetron hcl BP d) Imp G d) (3RS)- 3-[(1H- imidazol- 1-yl)methyl]- 9-methyl- 1,2,3,9- tetrahydro- 4H-carbazol- 4-one(C-dem- ethylond- ansetron), 
Ondansetron hcl BP e) Imp H e) (3RS)- 3-[(2-methyl- 1H-imidazol- 1-yl)methyl]- 1,2,3,9-tetrahy- dro-4H-carbazol- 4-one(N-deme- thylondansetron). 
Ondansetron hcl USP Related comp- ound A 3[(dimeth- ylamino) methyl]-1,2,3,9- tetrahydro- 9-methyl-4H- carbazol-4-one hydrochloride 
Ondansetron hcl USP Related comp- ound D 1,2,3,9- Tetrahydro- 9-methyl- s3-methylene- 4H-carbazol- 4-one 
Ondansetron hcl USP Related Comp- ound C 1,2,3,9- Tetrahydro- 9-methyl- 4H-carbazol- 4-one 
Ornidazole INHa) Ornid- azole epoxide 
Ornidazole INHb) Ornid- azolediol 
Oxaliplatin BP impurity A ethanedioic acid(oxalic acid) 
Pantoprazole sodium INHPharm- europa Imp A Pantoprazole sulphone is 5(Difluoro methoxy)- 2-[[(3,4- dimethoxy- 2-pyridinyl) methyl] sulphonyl]- 1H-benzimi- dazole 
Pantoprazole sodium INHPantop- razole sulphide 5-(Difluo- romethoxy)-} 2- [[3,4-dimethoxy- 2-pyridinyl] methyl] thio]-1H-benzimi- dazole 
Pantoprazole sodium sesquihydrate INHPantop- razole sulpho ne-N- oxide 5-(Difluoro methoxy)- 2-[[3,4- dimethoxy- 2-pyridin -1-oxidenyl] methyl] sulphonyl]- 1H-benzimi- dazole 
Paroxetine hydrochloride INHa) PR-VI Compound 
Paroxetine hydrochloride INHb) PR-VII Compound 
Potassium Clavulanate BP a) Imp A a) 2,2�- (pyrazine- 2,5-diyl) diethanol 
Potassium Clavulanate BP b) Imp B b) 3-[3,6- bis(2-hyd- roxyethyl) pyrazine- 2-yl}-propanoic acid 
Potassium Clavulanate BP c) Imp C c) 2,2�-(3-Ethyl pyrazine-2,5- diyl Diethanol 
PramipexoleINHa) Pramipexole impurity 'E'
PramipexoleINHb) PX-6 Compound 
PramipexoleINHc) Impurity 'D' of Pramipexole 
PramipexoleINHd) Impurity 'F' of Pramipexole 
PramipexoleINHe) Impurity 'A' of Pramipexole 
PramipexoleINHf) Pramipexole racemate compound 
Quetiapine fumarate INHa) QTPP--IMP A 
Quetiapine fumarate INHb) Qtp-04-imp B 
Rabeprazole sodium INHa) 2-[[[4-(3- Methoxypropoxy) -3-methyl-2- pyridinyl] methyl]thio]- 1H- benzimidazole 
Rabeprazole sodium INHb) 2-[[[4-(3- Methoxy propoxy)- 3-methyl- 2-pyridinyl] methyl] sulfonyl] -1H- benzimidazole 
Rabeprazole sodium INHc) 2-[[[4- (3-Methoxy)-3- methyl-2-pyrid- inyl]methyl] sulfonyl]-1H- benzimidazole 
Raloxifene HCL INHa) 6- Methyl sulfonyloxy-2- [(4-methyl sulfonyloxy) phenyl-3[4(2- (piperidinyl) ethoxy]-benzoyl] benzothiophene hydrochloride 
Raloxifene HCL INHb) 6- Hydroxy- 2[4-hydroxy- phenyl]- 3[4-hydroxy- benzoyl] benzothiophene 
Ramipril BP a) Imp E a) (2S,-3aS,6aS)- 1-[(S)-2-[[(S)-1- carboxy-3-phenyl- propyl]amino] propanoyl]octahy- drocyclo-penta[b] pyrrole-2- carboxylic acid(ramipril diacid),
RanitidineUSP a) Relat ed com- pound c a) N-[2-[[[5- [(dimethylamino) methyl]-2-furanyl] methyl]sulphinyl] ethyl ]-N-methyl- 2-Nitro1-1 Ethene diamine 
RanitidineUSPb) Relat ed com- pound A b) [5-[[2-aminoe- thyl)thio] methyl]-N-N-dim- ethyl-2-furan methan-amine, hemif-umarate salt] 
Ranitidine BPa) imp B a) 2-[[[5- [(dimethylamino) methyl]furan- 2-yl]methyl] sulphanyl] ethanamine, 
Ranitidine BP b) imp F b) [5-[(dim- ethylamino) methyl]furan-2- yl]methanol, 
Ranitidine BPc) imp G c) 3-(methy- lamino)-5,6- dihydro-2H-1, 4-thiazin-2-one- oxime, 
Rifampicin INH a) 3-Formy- lrifamy-cin sv 
Rifampicin INH b) Isonicotinyl hydrazone of rifampicin and isonia-zide
RisperidoneINH a) 4-(2,4- Difluoro benzoyl hydroxylamino) piperidine 
RisperidoneINH b) 6-Fluoro- 3-(4-piperidinyl) -1,2-benzi- soxazole monohydroch- loride 
RisperidoneINH c) 3-(2- chloroethyl)-2 -methyl-4H- pyrido(1,2-a) pyrimidin-4- one 
RisperidoneINH d) 6,7,8,9- tetrahydro-2 -methyl- 3-(2-chlo- roethyl) -4H-pyrido(1,2-a) pyrimidine -4-one hydro- chloride 
RisperidoneBP e) Imp C e)3-(2-(-4- (6-fluoro-1,2- benzisoxazol- 3-yl)-1-piperid- inyl)ethyl)- 2-methyl-4H- pyrido(1,2-a) pyrimidin-4-one 
RisperidoneINH f) Rispe- ridone N-oxide 
Salbutamol sulfate BP a) Imp C a) (1RS)-2- [(1,1-dimethy- lethyl)amino]- 1-(4-hyd- roxy-3-methyl- phenyl)ethanol, 
Salbutamol sulfate BP b) Imp D b) 5-[(1RS)-2- [(1,1-dimet- hylethyl)amino]- 1-hydroxyethyl]-2 -hydroxybenzald- ehyde, 
Salbutamol sulfate BP c) Imp I c) (1RS)-2-[(1,1- dimethylethyl) amino]-1-[3- (hydroxymethyl) -4-benzyloxyp- henyl]ethanol. 
Salmeterol Xinofoate BP a) Imp G a) 1-[4-hydroxy-3 -[[[2-hydroxy- 2- [4-hydroxy- 3-(hydroxymethyl) phenyl]ethyl] [6-(4-phenyl butoxy)hexyl] amino]methyl] phenyl]-2-[[6- (4-hen-ylbutoxy) hexyl]amino] ethanol. 
Salmeterol Xinofoate INH b) 1-hydroxy- 4[[2-hydroxy- 5-[1-hydroxy- 2-[[6-(-(4-Phenyl butoxy)hexyl] amino]ethyl] phenyl]methyl]- 2-naphth- alenecarbo- xylicacid 
Salmeterol Xinofoate BP c) Imp E c) 1-[4-hyd- roxy-3-(hydro- xymethyl)phenyl]- 2-[[6-(1-methyl- 3-phenylpropoxy) hexyl]amino] ethanol
Selegiline Hydrochloride BP Imp A (2RS)-N-methyl- 1-pheny-lpropan -2-amine[(RS)- metamphetamine] 
Sertraline hydrochloride INH a) IST-01 Compound 
Sertraline hydrochloride INH b) 3,4deschloro Sertraline 
Sertraline hydrochloride INH c) Sertraline base 
Sertraline hydrochloride INH d) Cis(1R, 4R) Sertraline HCl 
Sertraline hydrochloride INH e) NS-II Compound 
Sertraline hydrochloride INH f) Trans isomer of NS-III Compound 
Sertraline hydrochloride INH g) NS-III Compound (Racemic- sertraline) 
Sibutramine INH a) SM-III fumarate salt 
Sibutramine INH b) SM amide impurity 
Sibutramine INH c) Des-chloro Sibutramine 
Sildenafil INH a) Des methyl impurity of Sildenafil[3-[2- (dimethylamino) ethyl]-1-(hydro- xymethyl)-1H indol-5-yl] N-methyl methanesulpho- namide 
Stavudine BP a) Imp A a)5-methylpy- rimidine-2,4 (1H,3H)-dione (thymine) 
Stavudine INH b) 2�,3�-dideh- ydro,5�-O- Benzoyl,5-methyl uridine 
Sumatritan succinate USP Imp Related comp- ound 'C ([3-[2- (dimethylamino) ethyl]-1-(hydro- xy-methyl- 1H-indol- 5-yl]-N-methyl metha-nesulfo- namide succinate salt) 
Tamsulosin hydrochlo- ride INH a) (R)-5-{2-N,N bis[[2-(2-ethoxy phenoxy) ethyl]-amino] propyl}-2- methoxy benzene sulphonamide 
Tamsulosin hydrochlo- ride INH b) 2-methoxy- 5-[2-(1,methyl benzyl-amino) propyl]benzene sulphonamide 
Tamsulosin hydrochlo- ride INH c) (S)-5-{2-[[2- (2-ethoxy- phenoxy) ethyl)amino] propyl}2-methoxy benzenesulphona- mide 
Tamsulosin hydrochlo- ride INH d) 2-bromoethyl- 2-ethoxyphenyl ether 
Tegaserod Maleate INH a) 5-Methoxy 1H� Indole 3-carbaldehyde 
Tegaserod Maleate INH b) N-aminon- pentyl Guanidine 
Terbinafine hydrochlo- ride INH a) Terbinafine-Z- isomer N-[(2E)- 6,6-dimethyl- 2-hepten-4ynyl] N-methyl-1- naphth- alene-metha- namine 
Terbinafine hydrochlo- ride INH b) Dimmer impurity of terbinafine 
Tibolone INH a) ?-Tibolone 7?-methyl-17 ?- ethynyl-17? hydroxy estr- 5(10)- en-3-one 
Topiramate INH a) 2,3:4,5-bis- O-(1-methyl- ethylidene)- beta D fructopyranose 
Topiramate INH b) 2,3:4,5-bis- O-(1-methylethyli- dene)-beta-D- fructopyranose sulphamoyl azide 
Topotecan Hydrochloride INH a) Campt- othecin 
Topotecan Hydrochloride INH b) 10-Hydroxy camptothecin 
Torsemide USP Related comp- ound A (4[(3-methyl phenyl)amino]- 3-pyridine sulpho- namide) 
Trimetazi- dine dihydro- chloride BP a) Imp A a) 1-(3,4,5- trimeth- oxybenzyl) piperazine, 
Trimetazidine dihydrochlori- de BP b) Imp C b) 2,3,4 trimethoxy benzaldehyde 
Trimetazidine dihydrochlori- de BP c) Imp F c) 2,4,6 trimethoxy TMZ impurity 
Trimetazidine dihydrochlori- de BP d) Imp D d) 2,3,4trimet- hoxyphenyl methanol 
Trimetazidine dihydrochlori- de BP e) Imp B e) 1,4-bis(2,3,4- trimethoxybe- nzyl)pipera- zine, 
Trimetazidine dihydrochlori- de BP f) Imp E f) 1-(2,4,5- trimeth- oxybenzyl) piperazine, 
Venlafaxine hydrochloride BP a) Imp G a) (2RS)-2- cyclohexyl- 2-(4-methoxy- phenyl)-N,N- dimethyeth- anamine. 
Venlafaxine hydrochloride BP b) Imp D b) 1-[(1RS)-1-(4- methoxyphenyl)- 2-(methylamino) ethyl]cyclohe- xanol, 
Vincristine sulphate INH Desfo- rmyl vincr- istine 
Zidovudine BP Imp D Triphenyl methanol 
ZidovudineBP Imp C 5-methyl pyrimidine- 2,4(1H,3H)-dione (thymine)