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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Posaconazole iMpurity 1 Posaconazole iMpurity 1
Riociguat IMpurtiy Riociguat IMpurtiy
TelMisartan IMpurity E TelMisartan IMpurity E
IverMectin B1 Mono-sugar Derivative IverMectin B1 Mono-sugar Derivative 71837-27-9 C41H62O11
Desethyl Acetate (E)-CefuroxiMe Axetil Desethyl Acetate (E)-CefuroxiMe Axetil 97232-97-8 C16H16N4O8S
6-AMino-5-azacytidine 6-AMino-5-azacytidine 105331-00-8 C8H13N5O5
N-Methyl-3-phenylpropan-1-aMine hydrochloride (RelCpd B) N-Methyl-3-phenylpropan-1-aMine hydrochloride (RelCpd B) 30684-07-2 C10H16ClN
1-[2-[(2,6-diMethylphenyl)thio]phenyl]- Piperazine 1-[2-[(2,6-diMethylphenyl)thio]phenyl]- Piperazine 508233-76-9 C18H22N2S
1-(((2R,4R)-4-((Benzyloxy)methyl)-2-(2,4-difluorophenyl)tetrahydrofuran-2-yl)methyl)-1H-1,2,4-triazole 1-(((2R,4R)-4-((Benzyloxy)methyl)-2-(2,4-difluorophenyl)tetrahydrofuran-2-yl)methyl)-1H-1,2,4-triazole 165115-83-3 C21H21F2N3O2
1-Cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-[(4aR,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic Acid 1-Cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-[(4aR,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic Acid 855661-71-1 C21H24FN3O4
Iopamidol Impurity K Iopamidol Impurity K 1788899-70-6 C17H23I2N3O8
N-(2-(diethylamino)ethyl)-2-hydroxyquinoline-4-carboxamide N-(2-(diethylamino)ethyl)-2-hydroxyquinoline-4-carboxamide 87864-08-2 C16H21N3O2
5-(2-Fluorophenyl)-1-(3-pyridinylsulfonyl)-1H-pyrrole-3-carboxylic acid 5-(2-Fluorophenyl)-1-(3-pyridinylsulfonyl)-1H-pyrrole-3-carboxylic acid 1883595-37-6 C16H11FN2O4S
Ritonavir EP Impurity B Ritonavir EP Impurity B 765875-58-9 C28H36N4O4S
2-[4-(2,3-DIHYDROXYPROPOXY)PHENYL]ACETAMIDE 2-[4-(2,3-DIHYDROXYPROPOXY)PHENYL]ACETAMIDE 61698-76-8 C11H15NO4
3-OXO-3-(2,4,5-TRIFLUORO-3-METHOXY-PHENYL)-PROPIONIC ACID ETHYL ESTER 3-OXO-3-(2,4,5-TRIFLUORO-3-METHOXY-PHENYL)-PROPIONIC ACID ETHYL ESTER 112811-68-4 C12H11F3O4
2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-N5,N5- dimethylpyrimidine-4,5,6-triamine 2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-N5,N5- dimethylpyrimidine-4,5,6-triamine 1169770-52-8 C19H19FN8
Roxithromycin Impurity K Roxithromycin Impurity K
ClotriMazole IMpurity A ClotriMazole IMpurity A 23593-71-7 C22H17ClN2
9-Nitrominocycline 9-Nitrominocycline 149934-16-7 C23H26N4O9
N-(3,5-DiMethyladaMantan-1-yl)forMaMide N-(3,5-DiMethyladaMantan-1-yl)forMaMide 351329-88-9 C13H21NO
N-(Methylsulfonyl)-4'-nitro-2'-phenoxyMethanesulfonanilide N-(Methylsulfonyl)-4'-nitro-2'-phenoxyMethanesulfonanilide 51765-72-1 C14H14N2O7S2
Olanzapine ThioacetoxyMethylidene IMpurity Discontinued Olanzapine ThioacetoxyMethylidene IMpurity Discontinued 1320360-87-9 C17H20N4O2S
1-NaphthaleneethanaMine, 7-Methoxy-N-[2-(7-Methoxy-1-naphthalenyl)ethyl]- 1-NaphthaleneethanaMine, 7-Methoxy-N-[2-(7-Methoxy-1-naphthalenyl)ethyl]- 1385018-57-4 C26H27NO2
24R-Calcipotriol 24R-Calcipotriol 112827-99-3 C27H40O3
Methotrexate IMpurity C Methotrexate IMpurity C
Paroxetine EP IMpurity G Paroxetine EP IMpurity G 69675-10-1 C12H14FN
Itraconazole impurity C Itraconazole impurity C
1-cyclopropyl-8-ethoxy-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 1-cyclopropyl-8-ethoxy-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 143158-55-8 C15H13F2NO4
2-[3-Carboxy-4-(2-Methylpropoxy)phenyl]-4-Methyl-5-thiazolecarboxylic Acid 2-[3-Carboxy-4-(2-Methylpropoxy)phenyl]-4-Methyl-5-thiazolecarboxylic Acid 1239233-87-4 C16H17NO5S
4-(2-Methylpropyl)benzeneethanol 4-(2-Methylpropyl)benzeneethanol 36039-35-7 C12H18O
Dasatinib DiMeric IMpurity Dasatinib DiMeric IMpurity 910297-61-9 C36H34Cl2N12O2S2
Decarboxy Fexofenadine Decarboxy Fexofenadine 185066-37-9 C31H39NO2
Methotrexate α-Methyl Ester Methotrexate α-Methyl Ester 66147-29-3 C21H24N8O5
1-(2-amino-4,5-dimethoxyphenyl)ethan-1-one 1-(2-amino-4,5-dimethoxyphenyl)ethan-1-one 1071574-51-0 C10H13NO3
(+)-epipinoresinol-4-O-β-D-glucoside (+)-epipinoresinol-4-O-β-D-glucoside 74983-66-7 C26H32O11
2-[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]methylthio-1H-benzimidazole 2-[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]methylthio-1H-benzimidazole 103577-40-8 C16H14F3N3OS
Ethyl (3E)-3-(2-phenylhydrazin-1-ylidene)butanoate Ethyl (3E)-3-(2-phenylhydrazin-1-ylidene)butanoate 6078-46-2 C12H16N2O2
1-(5,6-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1-(5,6-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1824506-44-6 C12H15N
(S)-4-(4-((3-amino-2-hydroxypropyl)amino)phenyl)morpholin-3-one hydrochloride (S)-4-(4-((3-amino-2-hydroxypropyl)amino)phenyl)morpholin-3-one hydrochloride 1403383-55-0 C13H20ClN3O3
Terbutaline Impurity Terbutaline Impurity 882066-15-1 C33H37NO7S
Bis(4-fluorobenzyl)aMine Bis(4-fluorobenzyl)aMine 646051-52-7 C14H13F2N
2-(2-butyl-4-methyl-1-((2'-(1-methyl- 1H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyrimidin-5-yl)-N,Ndimethylethanethioamide 2-(2-butyl-4-methyl-1-((2'-(2-methyl- 2H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyri 2-(2-butyl-4-methyl-1-((2'-(1-methyl- 1H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyrimidin-5-yl)-N,Ndimethylethanethioamide 2-(2-butyl-4-methyl-1-((2'-(2-methyl- 2H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyri
ethyl 1-cyclopropyl-6-fluoro-7-((4aS,7aS)-hexahydro-1H-pyrrolo[3,4-b]pyridin-6(2H)-yl)-8-hydroxy-4-oxo-1,4-dihydroquinoline-3-carboxylate ethyl 1-cyclopropyl-6-fluoro-7-((4aS,7aS)-hexahydro-1H-pyrrolo[3,4-b]pyridin-6(2H)-yl)-8-hydroxy-4-oxo-1,4-dihydroquinoline-3-carboxylate C22H26FN3O4
Bepotastine N-Oxide Impurity Bepotastine N-Oxide Impurity
Nintedanib Impurity 25 Nintedanib Impurity 25
(RS)-3-tert-butyl 4-ethyl thiazolidine-3,4-dicarboxylate (RS)-3-tert-butyl 4-ethyl thiazolidine-3,4-dicarboxylate C11H19NO4S
Sugammadex sodium Org199129-1 Impurity Sugammadex sodium Org199129-1 Impurity
Sugammadex sodium Impurity 41 Sugammadex sodium Impurity 41
Apixaban Impurity 51 Apixaban Impurity 51 1620494-29-2 C33H32N4O5
4-(5-methyl-2-phenyloxazol-4-yl)benzenesulfonamide 4-(5-methyl-2-phenyloxazol-4-yl)benzenesulfonamide 2242749-01-3 C16H14N2O3S
Cefazolin Impurity EP-I Cefazolin Impurity EP-I
Cabozantinib impurity 42 Cabozantinib impurity 42
Cabozantinib impurity 55 Cabozantinib impurity 55
O-Desethyl Azilsartan O-Desethyl Azilsartan 1442400-68-1 C23H16N4O5
17- Phenyl Trinor Prostaglandin F2α Methyl Amide 17- Phenyl Trinor Prostaglandin F2α Methyl Amide 155206-01-2 C24H35NO4
CLOPIDOGREL RELATED COMPOUND C (20 MG) (METHYL (-)-(R)-(O-CHLOROPHENYL)-6,7-DIHYDROTHIE-NO[3,2-C]PYRIDINE-5(4H)-ACETATE, HYDROGEN SUL- FATE) CLOPIDOGREL RELATED COMPOUND C (20 MG) (METHYL (-)-(R)-(O-CHLOROPHENYL)-6,7-DIHYDROTHIE-NO[3,2-C]PYRIDINE-5(4H)-ACETATE, HYDROGEN SUL- FATE) 120202-71-3 C16H18ClNO6S2
TERBUTALINE IMPURITY C TERBUTALINE IMPURITY C 139508-58-0 C12H17NO3
ZIDOVUDINE IMPURITY B ZIDOVUDINE IMPURITY B
Acetamide, N-[2-hydroxy-3-[4-[[2-(1-methylethoxy)ethoxy]methyl]phenoxy]propyl]-N-(1-methylethyl)- Acetamide, N-[2-hydroxy-3-[4-[[2-(1-methylethoxy)ethoxy]methyl]phenoxy]propyl]-N-(1-methylethyl)- 66722-65-4 C20H33NO5
Pyrimidine, 4-bromo-6-(1-bromoethyl)-5-fluoro- Pyrimidine, 4-bromo-6-(1-bromoethyl)-5-fluoro- 1307315-02-1 C6H5Br2FN2
4-(3,4-dichlorophenyl)-N-methyl-3,4-dihydro-2H-naphthalen-1-imine oxide 4-(3,4-dichlorophenyl)-N-methyl-3,4-dihydro-2H-naphthalen-1-imine oxide 209473-00-7 C17H15Cl2NO
Tazobactam Impurity EBT Tazobactam Impurity EBT
Mixture of Cefoxitin Impurities E&F Mixture of Cefoxitin Impurities E&F
Faropenem Degradation Impurity 4 Faropenem Degradation Impurity 4
7-(2-hydroxy-1,1-dimethoxypropyl)-5H-chromeno[2,3-b]pyridin-5-ol 7-(2-hydroxy-1,1-dimethoxypropyl)-5H-chromeno[2,3-b]pyridin-5-ol
2-chloro-1-(5-methoxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one 2-chloro-1-(5-methoxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one
Oxacillin Impurity 3 Oxacillin Impurity 3 21106-64-9 C19H18ClN3O5S
Latanoprost Impurity 3 Latanoprost Impurity 3 2278245-92-2 C27H41BrO5
Ethyl 2-(2-Iodoethoxy)acetate Ethyl 2-(2-Iodoethoxy)acetate 56703-25-4 C6H11IO3
Butyphthalide impurity 53 Butyphthalide impurity 53
6,8-DIBROMO-3-CYCLOHEXYL-3,4-DIHYDRO-2(1H)-QUINAZOLINONE 6,8-DIBROMO-3-CYCLOHEXYL-3,4-DIHYDRO-2(1H)-QUINAZOLINONE 21237-84-3 C14H16Br2N2O
DESTHIAZOLYLMETHYL RITONAVIR DESTHIAZOLYLMETHYL RITONAVIR 256328-82-2 C33H43N5O4S
S-DIDEMETHYL CITALOPRAM S-DIDEMETHYL CITALOPRAM 166037-78-1 C18H17FN2O
METHOTREXATE DIMETHYL ESTER METHOTREXATE DIMETHYL ESTER 34378-65-9 C22H26N8O5
Canagliflozin Impurity 68 Canagliflozin Impurity 68
Dapoxetine impurity 51 Dapoxetine impurity 51
Doxofylline Impurity 20 Doxofylline Impurity 20
Dapoxetine impurity 64 Dapoxetine impurity 64
Dapoxetine impurity 58 Dapoxetine impurity 58
1-Ethyl-2-[[(2-methoxy-5-sulphamoyl 1-Ethyl-2-[[(2-methoxy-5-sulphamoyl
2-(4-Bromo-3-formylphenoxy)-benzonitrile 2-(4-Bromo-3-formylphenoxy)-benzonitrile 1160182-46-6 C14H8BrNO2
Carbetocin S-Oxide I Carbetocin S-Oxide I
Dolutegravir Impurity 15 Dolutegravir Impurity 15
1-(4-NITRO-PHENYL)-1H-PYRIDIN-2-ONE 1-(4-NITRO-PHENYL)-1H-PYRIDIN-2-ONE 53427-97-7 C11H8N2O3
PeraMpanel PeraMpanel 380919-67-5 C23H15N3O2
Empagliflozin Impurity 86 Empagliflozin Impurity 86
Olopatadine Impurity 11 HBr Olopatadine Impurity 11 HBr 4174-84-9 C21H24Br2NP
Iohexol Impurity P Iohexol Impurity P
Avibactam sodium Impurity CEA Avibactam sodium Impurity CEA
Sulbactam Impurity 2 Sulbactam Impurity 2 111790-24-0 C8H13NO6S
Vortioxetine Impurity 8 HCl Vortioxetine Impurity 8 HCl 2137722-14-4 C18H23ClN2S
Relugolix Impurity 1 Relugolix Impurity 1
Oseltamivir Diastereomer III HCl Oseltamivir Diastereomer III HCl 2413185-95-0 C16H28N2O4
Rocuronium bromide impurity (3,16,17-triol) Rocuronium bromide impurity (3,16,17-triol) C23H39NO4
4-(4-amino-3-chlorophenoxy)-7-methoxyquinoline-6-carboxylic acid 4-(4-amino-3-chlorophenoxy)-7-methoxyquinoline-6-carboxylic acid C17H13ClN2O4
Ornidazole Impurity 26 Ornidazole Impurity 26
Pitavastatin Impurity 73 Pitavastatin Impurity 73
Furosemide Impurity 24 Furosemide Impurity 24
Brivaracetam Impurity 34 Brivaracetam Impurity 34
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