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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Entecavir Impurity Entecavir Impurity 1333204-94-6 C12H15N5O3
Gadobutrol Impurity Gadobutrol Impurity
Lesinurad Impurity Lesinurad Impurity
Pramipexole Impurity G Pramipexole Impurity G
Salmeterol EP Impurity A Salmeterol EP Impurity A 1798014-51-3 C19H25NO3
Tacrolimus impurity D Tacrolimus impurity D
2-(2-(4-(2-(4-(1-(2-ethoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)propan-2-yl)-4,4-dimethyl-4,5-dihydrooxazole 2-(2-(4-(2-(4-(1-(2-ethoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)propan-2-yl)-4,4-dimethyl-4,5-dihydrooxazole 202189-77-3 C32H44N4O2
Saxagliptin Impurity 6 Saxagliptin Impurity 6
Alcaftadine N-Oxide Alcaftadine N-Oxide 952649-75-1 C19H21N3O2
Ethyl 4-(4-fluorophenyl)-1-methyl-2,6-dioxopiperidine-3-carboxylate Ethyl 4-(4-fluorophenyl)-1-methyl-2,6-dioxopiperidine-3-carboxylate 202534-94-9 C15H16FNO4
Tofacitinib Impurity H Tofacitinib Impurity H
3',6'-Dehydroclindamycin 3',6'-Dehydroclindamycin 1440605-51-5 C18H31ClN2O5S
Iguratimod Impurity 5 Iguratimod Impurity 5 84594-95-6 C13H11NO4
Cefradine Impurity F Cefradine Impurity F
Mirabegron Impurity Mirabegron Impurity 1684452-83-2 C26H28N6O3S2
1-methyl-1H-indol-6-ol 1-methyl-1H-indol-6-ol 130570-60-4 C9H9NO
2-(2-Hydroxyphenyl)-4-methyl-5-thiazolecarboxylic acid ethyl ester 2-(2-Hydroxyphenyl)-4-methyl-5-thiazolecarboxylic acid ethyl ester 118485-48-6 C13H13NO3S
32-Carboxycyanocobalamin 32-Carboxycyanocobalamin 121483-62-3 C63H87CoN13O15P
Alvimopan Impurity 6 Alvimopan Impurity 6
Acarbose Impurity B Acarbose Impurity B
Sofosbuvir Impurity28 Sofosbuvir Impurity28
Rivaroxaban Impurity 10 Rivaroxaban Impurity 10
Ipragliflozin Impurity 1 Ipragliflozin Impurity 1
(17α)-4-Bromo-17-hydroxy-3-oxo-19-norpregna-4,9-diene-21-nitrile (17α)-4-Bromo-17-hydroxy-3-oxo-19-norpregna-4,9-diene-21-nitrile 98149-13-4 C20H24BrNO2
316173-27-0 316173-27-0 316173-27-0 C17H28N2O5
Azilsartan Impurity Azilsartan Impurity 1821386-21-3 C22H18N4O4
Irbesartan impurity 7 Irbesartan impurity 7 C25H28N6O
Voriconazole Impurity 2 Voriconazole Impurity 2
Safinamide Impurity 1 Safinamide Impurity 1
Caspofungin impurit 2 Caspofungin impurit 2
Lamivudine impurity 1 Lamivudine impurity 1
Raltitrexed Impurity 1 Raltitrexed Impurity 1 1378372-01-0 C10H10N2O2
Loratadine Impurity 6 Loratadine Impurity 6 C22H23ClN2O2
Mirabegron Impurity 3 Mirabegron Impurity 3
Plerixafor Impurity C Plerixafor Impurity C
Vonoprazan Impuirty 8 Vonoprazan Impuirty 8
Sitagliptin IMpurity 4 Sitagliptin IMpurity 4
Brexpiprazole Impurity1 Brexpiprazole Impurity1
Acarbose Impurity E Acarbose Impurity E
Alvimopan Impurity 1 Alvimopan Impurity 1 2250243-53-7 C14H19NO
Febuxostat Impurity A Febuxostat Impurity A
Fingolimod Hexyl Impurity Fingolimod Hexyl Impurity 1201794-93-5 C17H29NO2
Palbociclib Impurity 1 Palbociclib Impurity 1
Trelagliptin Impurity 8 Trelagliptin Impurity 8
Bromhexine Impurity H Bromhexine Impurity H 63471-27-2 C14H21BrN2
Apixaban Impurity 17 Apixaban Impurity 17 1423803-24-0 C20H19N5O3
Rivaroxaban Impurity 11 Rivaroxaban Impurity 11 1411775-06-8 C14H17N3O4
(R)-2-(3-(diisopropylamino)-1-phenylpropyl)-4-(hydroxymethyl)phenyl propionate (R)-2-(3-(diisopropylamino)-1-phenylpropyl)-4-(hydroxymethyl)phenyl propionate C25H35NO3
Flomoxef Impurity 4 Flomoxef Impurity 4
Nicardipine Nicardipine
11,11'-(PIPERAZINE-1,4-DIYL)-BIS-8-CHLORO-5H-DIBENZE[B,E][1,4]-DIAZEPINE 11,11'-(PIPERAZINE-1,4-DIYL)-BIS-8-CHLORO-5H-DIBENZE[B,E][1,4]-DIAZEPINE 263366-81-0 C30H24Cl2N6
Sacubitril Impurity 7 Sacubitril Impurity 7 149709-44-4 C22H25NO5
Valsartan Impurity 5 Valsartan Impurity 5 1266616-11-8 C18H21N5
3-Hydroxy Agomelatine 3-Hydroxy Agomelatine 166526-99-4 C15H17NO3
Milnacipran Impurity 4 Milnacipran Impurity 4 1353644-49-1 C15H21NO2
(3S,5R)-Atorvastatin (3S,5R)-Atorvastatin 887324-52-9 C33H35FN2O5
Heptyl Deoctyl Fingolimod Hydrochloride Heptyl Deoctyl Fingolimod Hydrochloride 745767-97-9 C18H31NO2
Tenofovir Fumarate Tenofovir Fumarate 1246812-23-6 C21H34N5O9P
Prucalopride Impurity C Prucalopride Impurity C 1599434-55-5 C17H24ClN3O3
1-cyclopropyl-7-fluoro-8-methoxy-6-((4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 1-cyclopropyl-7-fluoro-8-methoxy-6-((4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 2205053-60-5 C21H24FN3O4
Brexpiprazole N-Oxide Brexpiprazole N-Oxide 1191900-58-9 C25H27N3O3S
2,6-Dibenzyloxyacetophenone 2,6-Dibenzyloxyacetophenone 3886-19-9 C22H20O3
ethyl(4aS,9bR)-6-bromo-1,3,4,4a,5,9b-hexahydro-2H-pyrido[4,3-b]indole-2-carboxylate ethyl(4aS,9bR)-6-bromo-1,3,4,4a,5,9b-hexahydro-2H-pyrido[4,3-b]indole-2-carboxylate 1059630-08-8 C14H17BrN2O2
diphenhydramine impurity diphenhydramine impurity C17H21NO
Pyridine, 4-chloro-2-(chloromethyl)-3,5-dimethyl-, hydrochloride Pyridine, 4-chloro-2-(chloromethyl)-3,5-dimethyl-, hydrochloride 143016-68-6 C8H10Cl3N
1,1-dimethyl-4-(2-methyl-10H-benzo[b]thieno[2,3-e][1,4]diazepin-4-yl)piperazin-1-ium iodide 1,1-dimethyl-4-(2-methyl-10H-benzo[b]thieno[2,3-e][1,4]diazepin-4-yl)piperazin-1-ium iodide C18H23IN4S
2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5-carboxylic acid 2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5-carboxylic acid 1657014-33-9 C16H16N2O3S
vildagliptin Impurity O vildagliptin Impurity O 2253194-12-4 C12H18N4O2
methyl (41R,12S,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate methyl (41R,12S,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate 38990-17-9 C21H26N2O3
1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethenamine 1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethenamine 1450657-31-4 C12H17NO4S
Apremilast Impurity D Apremilast Impurity D
Canagliflozin Impurity 17 Canagliflozin Impurity 17 1951467-28-9 C24H23FO6S
Canagliflozin Impurity 22 Canagliflozin Impurity 22
Carfilzomib Impurity 3 Carfilzomib Impurity 3
Dolutegravir Impurity 4 Dolutegravir Impurity 4
Febuxostat Impurity 20 Febuxostat Impurity 20
Lenvatinib Impurity 1 Lenvatinib Impurity 1
methyl (41S,12S,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate methyl (41S,12S,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate 83508-82-1 C21H26N2O3
4-[6-[(8-cyclopentyl-6-ethenyl-7,8-dihydro-5-methyl-7-oxopyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl]-1-piperazinecarboxylic acid tert-butyl ester 4-[6-[(8-cyclopentyl-6-ethenyl-7,8-dihydro-5-methyl-7-oxopyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl]-1-piperazinecarboxylic acid tert-butyl ester 1941177-45-2 C29H37N7O3
Cabozantinib impurity 1 Cabozantinib impurity 1 748707-58-6 C17H16N2O3
Amlodipine Impurity 19 Amlodipine Impurity 19 C26H31ClN2O8S
Amlodipine Impurity 9 Amlodipine Impurity 9 90445-05-9 C26H31ClN2O8S
Clopidogrel Impurity 7 Clopidogrel Impurity 7 444728-13-6 C15H15ClN2OS
Rivaroxaban Impurity 36 Rivaroxaban Impurity 36 1770812-39-9 C19H17Cl2N3O5S
(S)-methyl 2-((2'-(2H-tetrazol-5-yl)biphenyl-4-yl)methylamino)-3-methylbutanoate (S)-methyl 2-((2'-(2H-tetrazol-5-yl)biphenyl-4-yl)methylamino)-3-methylbutanoate 1111177-24-2 C20H23N5O2
Clopidogrel Impurity C Clopidogrel Impurity C 1346605-15-9 C16H18ClNO2S
Nilotinib genotoxic impurity 2 Nilotinib genotoxic impurity 2 1157857-29-8 C19H15F3N4O3
NCFJJNFEEPMRAQ-XMMPIXPASA-N NCFJJNFEEPMRAQ-XMMPIXPASA-N 1453221-45-8 C35H41F6N3O6
Gliclazide Impurity E Gliclazide Impurity E
Ethyl 1-butanesulfonate Ethyl 1-butanesulfonate 2374-68-7 C6H14O3S
OLANEXIDINE intermediate OLANEXIDINE intermediate 60852-95-1 C10H20N4
1H-Isoindole, octahydro-, trans- 1H-Isoindole, octahydro-, trans- 10479-63-7 C8H15N
1H-Purine-2,6-dione,8-[2-(3,4-dihydroxyphenyl)ethenyl]-1,3-diethyl-3,7-dihydro-7-methyl-, (E)-(9CI) 1H-Purine-2,6-dione,8-[2-(3,4-dihydroxyphenyl)ethenyl]-1,3-diethyl-3,7-dihydro-7-methyl-, (E)-(9CI) 155272-03-0 C18H20N4O4
Hexanoicacid, 3-(2-amino-2-oxoethyl)-5-methyl-, (3S)- Hexanoicacid, 3-(2-amino-2-oxoethyl)-5-methyl-, (3S)- 181289-34-9 C9H17NO3
Ethanedioic acid, monoethyl ester, 2-(4-methoxyphenyl)hydrazide Ethanedioic acid, monoethyl ester, 2-(4-methoxyphenyl)hydrazide 2614-10-0 C11H14N2O4
4-Pyridinecarboxamide, N-[2-(nitrooxy)ethyl]-, mononitrate 4-Pyridinecarboxamide, N-[2-(nitrooxy)ethyl]-, mononitrate 65141-48-2 C8H10N4O7
1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-5-hydroxy-pyrimidine-2,4-dione 1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-5-hydroxy-pyrimidine-2,4-dione 69321-95-5 C9H12N2O7
2-(ACETOXYMETHYL)-4-METHOXY-3,5-DIMETHYLPYRIDINE 2-(ACETOXYMETHYL)-4-METHOXY-3,5-DIMETHYLPYRIDINE 91219-90-8 C11H15NO3
4,4'-(4H-1,2,4-TRIAZOL-4-YLMETHYLENE)BIS BENZONITRILE 4,4'-(4H-1,2,4-TRIAZOL-4-YLMETHYLENE)BIS BENZONITRILE 112809-52-6 C17H11N5
Pregna-1,4,9(11)-triene-3,20-dione,21-(acetyloxy)-17-hydroxy-6-methyl-, (6a)- Pregna-1,4,9(11)-triene-3,20-dione,21-(acetyloxy)-17-hydroxy-6-methyl-, (6a)- 93239-37-3 C24H30O5
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