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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Desfluoro flurbiprofen axetil Desfluoro flurbiprofen axetil 1685278-08-3 C19H20O4
Desloratadine IMpurity 6 Desloratadine IMpurity 6 38092-90-9 C20H21ClN2
ErtapeneM Ring Open IMpurity ErtapeneM Ring Open IMpurity
LincoMycin iMpurity C LincoMycin iMpurity C
Norfloxacin iMpurity E Norfloxacin iMpurity E
Posaconazole iMpurity 2 Posaconazole iMpurity 2
Quetiapine IMpurity [2-(2-Piperazin-1-yl)ethoxy)ethanol] Quetiapine IMpurity [2-(2-Piperazin-1-yl)ethoxy)ethanol] 2206135-50-2 C25H18N2S2
Rabeprazole iMpurity (Chloro interMediate) Rabeprazole iMpurity (Chloro interMediate)
TaMsulosin IMpurity F TaMsulosin IMpurity F C20H28N2O5S
TiaMulin IMpurity E (TiaMulone,11-Oxo TiaMulin) TiaMulin IMpurity E (TiaMulone,11-Oxo TiaMulin) 113323-39-0 C28H45NO4S
2-(2-(4-(Dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)ethoxy)ethanol 2-(2-(4-(Dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)ethoxy)ethanol 848814-27-7 C21H27N3O3S
(3aR,7R,7aR)-2,2-Diethyl-3a,6,7,7a-tetrahydro-7-[(Methylsulfonyl)oxy]-1,3-benzodioxole-5-carboxylic Acid Ethyl Ester (3aR,7R,7aR)-2,2-Diethyl-3a,6,7,7a-tetrahydro-7-[(Methylsulfonyl)oxy]-1,3-benzodioxole-5-carboxylic Acid Ethyl Ester 204254-90-0 C15H24O7S
TorseMide Carboxylic Acid TorseMide Carboxylic Acid 113844-99-8 C16H18N4O5S
(6-BroMo-2-ethyl-3-benzofuranyl)(3,5-dibroMo-4-hydroxyphenyl)Methanone (6-BroMo-2-ethyl-3-benzofuranyl)(3,5-dibroMo-4-hydroxyphenyl)Methanone 1402819-05-9 C17H11Br3O3
ApreMilast IMpurity ApreMilast IMpurity 2438558-63-3 C21H22N2O7S
5'-broMo-[2,3'-bipyridin]-6'(1'H)-one 5'-broMo-[2,3'-bipyridin]-6'(1'H)-one 381233-79-0 C10H7BrN2O
(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 3026677-40-4
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
Entecavir  Impurity Entecavir Impurity 1333204-94-6 C12H15N5O3
Gadobutrol Impurity Gadobutrol Impurity 71231-87-3 C7H15NO5
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 Impurity 5 Nicardipine Impurity 5
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
Engleet net impurity 07 Engleet net impurity 07 1620758-33-9 C23H27ClO7
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
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