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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Crisaborole Impurity ABCDEFGHJKL Crisaborole Impurity ABCDEFGHJKL
3-Azetidinecarboxylic acid, 1-[(4-acetyl-2-ethylphenyl)methyl]- 3-Azetidinecarboxylic acid, 1-[(4-acetyl-2-ethylphenyl)methyl]- 2474774-17-7 C15H19NO3
3-(7,8-dimethoxy-2-oxo-1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)-N-(((S)-3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)-N-methylpropan-1-amine oxide 3-(7,8-dimethoxy-2-oxo-1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)-N-(((S)-3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)-N-methylpropan-1-amine oxide 2511244-97-4 C27H36N2O6
2,4,6,3',5'-pentamethoxybiphenyl 2,4,6,3',5'-pentamethoxybiphenyl 84212-55-5 C17H20O5
Labetalol EP Impurity I Labetalol EP Impurity I
(Asp4)-Carbetocin (Impurity G) (Asp4)-Carbetocin (Impurity G)
Sulfamide, N-[5-(4-bromophenyl)-6-[2-[(5-chloro-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N'-propyl- Sulfamide, N-[5-(4-bromophenyl)-6-[2-[(5-chloro-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N'-propyl- 2443747-63-3 C19H20BrClN6O4S
methyl 3-oxo1,2-benzisothiazole-2(3H)-acetate 1,1-dioxide methyl 3-oxo1,2-benzisothiazole-2(3H)-acetate 1,1-dioxide 6639-62-9 C10H9NO5S
(6R-cis)-3-(hydroxymethyl)-7-methoxy-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R-cis)-3-(hydroxymethyl)-7-methoxy-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 54333-94-7 C15H16N2O6S2
5-acetyl-1,3-phenylene bis(dimethylcarbamate) 5-acetyl-1,3-phenylene bis(dimethylcarbamate) 81732-48-1 C14H18N2O5
Oseltamivir Impurity L Oseltamivir Impurity L
1,4-Naphthalenediol, 2-methyl-, 4-acetate 1,4-Naphthalenediol, 2-methyl-, 4-acetate 110327-29-2 C13H12O3
2-(N,N-DIETHYLAMINO)-4,6-DICHLOROTRIAZINE 2-(N,N-DIETHYLAMINO)-4,6-DICHLOROTRIAZINE 2401-64-1 C5H6Cl2N4
(S)-4-Chloro-1,3-butanediol (S)-4-Chloro-1,3-butanediol 139013-68-6 C4H9ClO2
6-CHLORO-1-METHYLURACIL 6-CHLORO-1-METHYLURACIL 31737-09-4 C5H5ClN2O2
5-(Propylthio)-1H-benzimidazol-2-amine 5-(Propylthio)-1H-benzimidazol-2-amine 80983-36-4 C10H13N3S
Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate 179688-26-7 C15H21NO8
Hexyl methanesulfonate Hexyl methanesulfonate 16156-50-6 C7H16O3S
2-[(5-CARBOXY-4-METHOXY-3-METHYLPYRID-2-YL)-METHYLSULFO]-5-METHOXYBENZIMIDAZOLE 2-[(5-CARBOXY-4-METHOXY-3-METHYLPYRID-2-YL)-METHYLSULFO]-5-METHOXYBENZIMIDAZOLE 120003-72-7 C17H17N3O5S
Gadobutrol Impurity 3 Gadobutrol Impurity 3
Empagliflozin Impurity 84 Empagliflozin Impurity 84
Iohexol Impurity O Iohexol Impurity O
Avibactam sodium Impurity CES Avibactam sodium Impurity CES
(2,5-dichlorophenyl)(4-ethoxyphenyl)methanone (2,5-dichlorophenyl)(4-ethoxyphenyl)methanone 1097076-93-1 C15H12Cl2O2
Lenvatinib impurity LFZZ-10 Lenvatinib impurity LFZZ-10 C11H8Cl2N2O2
(2S,5S)-(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl 5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate (2S,5S)-(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl 5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate
Febuxostat Impurity 98 Febuxostat Impurity 98
(2-(methyl((vinyloxy)carbonyl)amino)pyridin-3-yl)methyl 2-(methylamino)acetate hydrochloride (2-(methyl((vinyloxy)carbonyl)amino)pyridin-3-yl)methyl 2-(methylamino)acetate hydrochloride
1-(4-bromo-3,5-dimethoxyphenyl)ethanone 1-(4-bromo-3,5-dimethoxyphenyl)ethanone 1333472-28-8 C10H11BrO3
Ticagrelor Impurity 117 Ticagrelor Impurity 117
Ticagrelor Impurity 136 Ticagrelor Impurity 136
Phenol, 2-(diphenylmethyl)-5-methyl- Phenol, 2-(diphenylmethyl)-5-methyl- 411239-19-5 C20H18O
1-Cyclohexene-1-carboxylic acid, 4-(acetylamino)-3-(1-ethylpropoxy)-5-(formylamino)-, ethyl ester, (3R,4R,5S)- 1-Cyclohexene-1-carboxylic acid, 4-(acetylamino)-3-(1-ethylpropoxy)-5-(formylamino)-, ethyl ester, (3R,4R,5S)- 2148317-96-6 C17H28N2O5
Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-(5-chloro-2-ethoxyphenyl)-5-methyl-7-propyl- Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-(5-chloro-2-ethoxyphenyl)-5-methyl-7-propyl- 2245167-80-8 C17H19ClN4O2
Posaconazole impurity 18 Posaconazole impurity 18 1819334-66-1 C44H49F2N8O4+
(4S,6R)-6-(2-(tert-butoxy)-2-oxoethyl)-2,2-dimethyl-1,3-dioxane-4-carboxylic acid (4S,6R)-6-(2-(tert-butoxy)-2-oxoethyl)-2,2-dimethyl-1,3-dioxane-4-carboxylic acid 2095786-11-9 C13H22O6
Crisaborole intermediate Crisaborole intermediate 2354382-27-5 C14H8BCl2NO3
Ropivacaine Impurity 48 Ropivacaine Impurity 48
2,4-Heptadienoic acid, 7-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]-, (2Z,4E)- 2,4-Heptadienoic acid, 7-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]-, (2Z,4E)- 1148131-09-2 C33H31FN2O3
2(3H)-Furanone, dihydro-4-(1-methylethyl)-, (4S)- 2(3H)-Furanone, dihydro-4-(1-methylethyl)-, (4S)- 53657-15-1 C7H12O2
Crisaborole Impurity 9 HCl Crisaborole Impurity 9 HCl 1187187-01-4 C14H15BClNO3
2H-Indol-2-one, 3-[[3,5-dimethyl-4-(1-pyrrolidinylcarbonyl)-1H-pyrrol-2-yl]methylene]-5-fluoro-1,3-dihydro- 2H-Indol-2-one, 3-[[3,5-dimethyl-4-(1-pyrrolidinylcarbonyl)-1H-pyrrol-2-yl]methylene]-5-fluoro-1,3-dihydro- 2135339-43-2 C20H20FN3O2
Nicergoline Impurity 02 Nicergoline Impurity 02
5-CHLOROTHIOPHENE-3-CARBOXYLIC ACID 5-CHLOROTHIOPHENE-3-CARBOXYLIC ACID 36157-42-3 C5H3ClO2S
(S)-(+)-1-[(4-Chlorophenyl)phenylmethyl]piperazine (S)-(+)-1-[(4-Chlorophenyl)phenylmethyl]piperazine 439858-21-6 C17H19ClN2
2,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one 2,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one 133330-61-7 C14H9Cl2NO
2-Isopropyl-6-propylphenol (Propofol Impurity O) 2-Isopropyl-6-propylphenol (Propofol Impurity O) 74663-48-2 C12H18O
3-Methyl-2-(3,4-dimethoxyphenyl)butyronitrile 3-Methyl-2-(3,4-dimethoxyphenyl)butyronitrile 20850-49-1 C13H17NO2
HYDROXY ITRACONAZOLE HYDROXY ITRACONAZOLE 112559-91-8 C35H38Cl2N8O5
1-HEXADECANOYL-2-(P-NITROPHENOXYSUCCINOYL)-SN-GLYCERYL-3-PHOSPHORYLCHOLINE 1-HEXADECANOYL-2-(P-NITROPHENOXYSUCCINOYL)-SN-GLYCERYL-3-PHOSPHORYLCHOLINE 170569-87-6 C16H12F3N3O2S
N-methyl-N-(4-nitrophenyl)-2-(piperazin-1-yl)acetamide N-methyl-N-(4-nitrophenyl)-2-(piperazin-1-yl)acetamide 1038972-16-5 C13H18N4O3
1,4-BIS[3,4-DIHYDRO-2(1H)-QUINOLINON-7-OXY]BUTANE 1,4-BIS[3,4-DIHYDRO-2(1H)-QUINOLINON-7-OXY]BUTANE 882880-12-8 C22H24N2O4
(R)-SN-38 (R)-SN-38 647852-82-2 C22H20N2O5
5'-Deoxy-5-fluoro-N4-(isopentyloxycarbonyl)cytidine 5'-Deoxy-5-fluoro-N4-(isopentyloxycarbonyl)cytidine 162204-30-0 C15H22FN3O6
Bromhexine ImpurityABCDEFGHJKL Bromhexine ImpurityABCDEFGHJKL
1-Butanone, 1-(4-fluorophenyl)-4-[(6bR,10aR)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxalin-8(7H)-yl]- 1-Butanone, 1-(4-fluorophenyl)-4-[(6bR,10aR)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxalin-8(7H)-yl]- 1576240-16-8 C24H28FN3O
impurity 37 impurity 37
Aprepitant impurity 3 Aprepitant impurity 3
sodium (6R,7S)-7-(2-(1H-tetrazol-1-yl)acetamido)-3-(((5-methyl- 1,3,4-thiadiazol-2-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate sodium (6R,7S)-7-(2-(1H-tetrazol-1-yl)acetamido)-3-(((5-methyl- 1,3,4-thiadiazol-2-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
1,4,7,10-Tetraazacyclododecane-1,4-diacetic acid 1,4,7,10-Tetraazacyclododecane-1,4-diacetic acid 229312-34-9 C12H24N4O4
Pentanoic acid, 3-(bromomethyl)-4-methyl-, ethyl ester, (3S)- Pentanoic acid, 3-(bromomethyl)-4-methyl-, ethyl ester, (3S)- 2432911-38-9 C9H17BrO2
Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-[5-[(4-ethyl-1-piperazinyl)sulfonyl]-2-hydroxyphenyl]-5-methyl-7-propyl- Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-[5-[(4-ethyl-1-piperazinyl)sulfonyl]-2-hydroxyphenyl]-5-methyl-7-propyl- 2411340-39-9 C21H28N6O4S
3-Azetidineacetonitrile, 1-(ethylsulfonyl)-3-[4-[7-(hydroxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-1H-pyrazol-1-yl]- 3-Azetidineacetonitrile, 1-(ethylsulfonyl)-3-[4-[7-(hydroxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-1H-pyrazol-1-yl]- 1187595-89-6 C17H19N7O3S
4-methyl-N-(2-(methylamino)phenyl)-2-propyl-1H-benzo[d]imidazole-6-carboxamide 4-methyl-N-(2-(methylamino)phenyl)-2-propyl-1H-benzo[d]imidazole-6-carboxamide 884330-18-1 C19H22N4O
Benzeneacetic acid, 3-(2-amino-1,1-dimethyl-2-oxoethyl)-α,α-dimethyl-5-(1H-1,2,4-triazol-1-ylmethyl)- Benzeneacetic acid, 3-(2-amino-1,1-dimethyl-2-oxoethyl)-α,α-dimethyl-5-(1H-1,2,4-triazol-1-ylmethyl)- 2469244-33-3 C17H22N4O3
2,4(1H,3H)-Pyrimidinedione, 5-(2-fluoro-3-methoxyphenyl)-1-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-3-[(2R)-2-(hydroxyamino)-2-phenylethyl]-6-methyl- 2,4(1H,3H)-Pyrimidinedione, 5-(2-fluoro-3-methoxyphenyl)-1-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-3-[(2R)-2-(hydroxyamino)-2-phenylethyl]-6-methyl- 2486454-64-0 C28H24F5N3O4
3-Quinolinecarbonitrile, 4-[(2,4-dichloro-5-hydroxyphenyl)amino]-6-hydroxy-7-[3-(4-methyl-1-piperazinyl)propoxy]- 3-Quinolinecarbonitrile, 4-[(2,4-dichloro-5-hydroxyphenyl)amino]-6-hydroxy-7-[3-(4-methyl-1-piperazinyl)propoxy]- 2468737-94-0 C24H25Cl2N5O3
1H-Pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline, 2,3,6b,7,8,9,10,10a-octahydro-, (6bR,10aS)- 1H-Pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline, 2,3,6b,7,8,9,10,10a-octahydro-, (6bR,10aS)- 313368-81-9 C13H17N3
Ergoline-8-methanol, 1,6-dimethyl-, (8β)- (9CI) Ergoline-8-methanol, 1,6-dimethyl-, (8β)- (9CI) 40170-12-5 C17H22N2O
Avatrombopag Impurity 22 Avatrombopag Impurity 22
Avatrombopag Impurity 33 Avatrombopag Impurity 33
Cisatracurium besylate impurity 16 Cisatracurium besylate impurity 16
1-ACETYL-2-METHYLBENZIMIDAZOLE 1-ACETYL-2-METHYLBENZIMIDAZOLE 14678-81-0 C10H10N2O
(E)-3-(2-Formylphenyl)-2-propenoic acid 1,1-dimethyl ethyl ester (E)-3-(2-Formylphenyl)-2-propenoic acid 1,1-dimethyl ethyl ester 103890-69-3 C14H16O3
1H-Dibenz[e,g]indole-1-heptanoic acid, 9-fluoro-2,3-dihydro-β,δ-dihydroxy-3-(1-methylethyl)-2-oxo-3-[(phenylamino)carbonyl]-, (βR,δR)- 1H-Dibenz[e,g]indole-1-heptanoic acid, 9-fluoro-2,3-dihydro-β,δ-dihydroxy-3-(1-methylethyl)-2-oxo-3-[(phenylamino)carbonyl]-, (βR,δR)- 1046533-62-3 C33H33FN2O6
Bimatoprost Impurity 22 Bimatoprost Impurity 22
Bumetanide Impurity 9 Bumetanide Impurity 9
Crisaborole Impurity 14 Crisaborole Impurity 14
Benzonitrile, 4-[(1E)-4-(dimethylamino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxymethyl)- Benzonitrile, 4-[(1E)-4-(dimethylamino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxymethyl)- 1370643-23-4 C20H21FN2O
Latamoxef impurity B Latamoxef impurity B
(9alpha,13alpha,14alpha)-3-methoxymorphinan-17-carbaldehyde (9alpha,13alpha,14alpha)-3-methoxymorphinan-17-carbaldehyde 28973-48-0 C18H23NO2
(2R,4R)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic acid (2R,4R)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic acid 1012341-56-8 C23H29NO4
Alogliptin Impurity A Alogliptin Impurity A
Linagliptin Impurity D Linagliptin Impurity D 666816-91-7 C20H28N6O4
Parecoxib Impurity C Parecoxib Impurity C
Rac Atomoxetine Hydrochloride Rac Atomoxetine Hydrochloride 82857-40-7 C17H22ClNO
3-(1H-imidazol-1-yl)-5-(trifluoromethyl)aniline 3-(1H-imidazol-1-yl)-5-(trifluoromethyl)aniline 943320-48-7 C10H8F3N3
Linagliptin Impurity H Linagliptin Impurity H 1646355-34-1 C22H23N7O2
Ezetimibe Impurity 54 Ezetimibe Impurity 54 1185883-39-9 C40H36F2N2O5
2-(2-fluorophenyl)-1,3-di(1H-1,2,4-triazol-1-yl)propan-2-ol 2-(2-fluorophenyl)-1,3-di(1H-1,2,4-triazol-1-yl)propan-2-ol 1348664-75-4 C13H13FN6O
Dapagliflozin Impurity 2 Dapagliflozin Impurity 2
Imatinib Impurity 1 Imatinib Impurity 1
Imatinib Impurity 6 Imatinib Impurity 6
Nifedipine Impurity 3 Nifedipine Impurity 3 C19H22N2O6
Riociguat Impurtiy 5 Riociguat Impurtiy 5
Vonoprazan Impurity 6 Vonoprazan Impurity 6
Avibactam Impurity Avibactam Impurity 1797133-98-2 C7H12N3NaO6S
Citalopram EP Impurity E Citalopram EP Impurity E 64169-47-7 C19H22Cl2FNO
Dapagliflozin Impurity F Dapagliflozin Impurity F
Dapoxetine Impurity A Dapoxetine Impurity A
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