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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
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
Methyl 3-aMino-2-((2'-carbaMoylbiphenyl-4-yl)MethylaMino)benzoate Methyl 3-aMino-2-((2'-carbaMoylbiphenyl-4-yl)MethylaMino)benzoate 147404-75-9 C22H21N3O3
3-Methyl cefdinir 3-Methyl cefdinir 71091-93-5 C13H13N5O5S2
3-Methyl- N-[4-trifluo- roMethyl) phenyl]-4- isoxazole carboxaMide 3-Methyl- N-[4-trifluo- roMethyl) phenyl]-4- isoxazole carboxaMide
2-[[[4-(2,2,2-Trifluoroethoxy)-3-Methyl-1-oxopyridin-2-yl]Methyl]sulfanyl]-1H-benziMidazole 2-[[[4-(2,2,2-Trifluoroethoxy)-3-Methyl-1-oxopyridin-2-yl]Methyl]sulfanyl]-1H-benziMidazole 163119-30-0 C16H14F3N3O2S
(11β,16β)-9-BroMo-11-hydroxy-16-Methyl-17,21-bis(1-oxopropoxy)pregna-1,4-diene-3,20-dione (11β,16β)-9-BroMo-11-hydroxy-16-Methyl-17,21-bis(1-oxopropoxy)pregna-1,4-diene-3,20-dione 52092-14-5 C28H37BrO7
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
Bendamustine Deschloro Dimer Impurity Bendamustine Deschloro Dimer Impurity 1391052-61-1 C32H44N6O7
Benzenepropanoic acid, β-aMino-α-hydroxy-, Methyl ester, (αR,βR)- Benzenepropanoic acid, β-aMino-α-hydroxy-, Methyl ester, (αR,βR)- 157722-44-6 C10H13NO3
Benzenebutanoicacid,b-aMino-2,4,5-trifluoro-,Methylester,(bR)- Benzenebutanoicacid,b-aMino-2,4,5-trifluoro-,Methylester,(bR)- 881995-69-3 C11H12F3NO2
Avanafil iMpurity 2 Avanafil iMpurity 2
Bisoprolol IMpurity Bisoprolol IMpurity 2226263-67-6 C18H31NO4
Decitabine iMpurity 5 Decitabine iMpurity 5
Erlotinib iMpurity 3 Erlotinib iMpurity 3 328528-74-1 C20H22BrN3O4
LevetiracetaM IMpurity 3 LevetiracetaM IMpurity 3 1543353-92-9 C8H15NO4
(3R,4R,5R)-4-(1-Ethylpropoxy)-3-hydroxy-5-[(Methylsulfonyl)oxy]-1-cyclohexene-1-carboxylic Acid Ethyl Ester (3R,4R,5R)-4-(1-Ethylpropoxy)-3-hydroxy-5-[(Methylsulfonyl)oxy]-1-cyclohexene-1-carboxylic Acid Ethyl Ester 204254-94-4 C15H26O7S
9,11-Anhydrobudesonide 9,11-Anhydrobudesonide 313474-58-7 C25H32O5
iperazineacetic acid, 4-[(4- chlorophenyl)phenylMethyl]- iperazineacetic acid, 4-[(4- chlorophenyl)phenylMethyl]- 113740-61-7 C19H21ClN2O2
EveroliMus-d4 EveroliMus-d4 1338452-54-2 C53H79D4NO14
3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one 3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one 153139-56-1 C16H20N2O
6-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)- 7,9-dihydro-8H-purin-8-one 6-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)- 7,9-dihydro-8H-purin-8-one 1361569-10-9 C18H13FN8O
Apremilast impurity 32 Apremilast impurity 32
Baricitinib Impurity 5 Baricitinib Impurity 5
Bendamustine Impurity 28 Bendamustine Impurity 28
Bortezomib Impurity 20 Bortezomib Impurity 20
Canagliflozin Impurity 27 Canagliflozin Impurity 27 2265214-89-7 C18H14BrFS
Edoxaban Impurity 23 (1S,2S,4R) Edoxaban Impurity 23 (1S,2S,4R)
Edoxaban Impurity 38 Edoxaban Impurity 38 2081883-53-4 C14H27N3O3
Ezetimibe Impurity 33 Ezetimibe Impurity 33 1829558-53-3 C13H10FNO
Imatinib Impurity 14 Imatinib Impurity 14
Levofloxacin Impurity 20 Levofloxacin Impurity 20 C18H20FN3O4
Pantoprazole Impurity 12 Pantoprazole Impurity 12
Solifenacin Related Compound 7 Solifenacin Related Compound 7
Vonoprazan Impurity 12 Vonoprazan Impurity 12
Avibactam Impurity A Avibactam Impurity A
Avibactam Impurity F Avibactam Impurity F
Brexpiprazole Impurity K Brexpiprazole Impurity K
Cefaclor Impurity 3 Cefaclor Impurity 3
Milrinone Impurity 7 Milrinone Impurity 7 2250242-59-0 C14H13N3O
Silodosin Impurity 1 Silodosin Impurity 1
Sulpiride Impurity 1 Sulpiride Impurity 1
Tenofovir Impurity 54 Tenofovir Impurity 54
Trelagliptin Impurity Y Trelagliptin Impurity Y 1938080-42-2 C13H10FN3O3
Trelagliptin Impurity Y Trelagliptin Impurity Y 1938080-42-2 C13H10FN3O3
Cefathiamidine Impurity 10 Cefathiamidine Impurity 10
Nebivolol Impurity 3 Nebivolol Impurity 3 1029684-20-5 C18H20FNO2
Pemetrexed Pemetrexed 155405-79-1 C12H13BrO3
ethyl 2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5- carboxylate ethyl 2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5- carboxylate 2230270-05-8 C18H20N2O3S
Cefminox Sodium Impurity 6 Cefminox Sodium Impurity 6
Flurbiprofen Impurity 7 Flurbiprofen Impurity 7
Imidafenacin Impurity 8 Imidafenacin Impurity 8 503598-05-8 C20H21N3O3
Pregabalin Impurity E Pregabalin Impurity E 1239692-16-0 C11H24ClNO2
Rosuvastatin Impurity 86 Rosuvastatin Impurity 86
Cefathiamidine Impurity 8 Cefathiamidine Impurity 8
Urapidil impurity 7 Urapidil impurity 7 108997-11-1 C24H34N4O2
methyl 3-[[4-chloro-2-(phenylamino)phenyl]methylamino]-3-oxopropanoate. methyl 3-[[4-chloro-2-(phenylamino)phenyl]methylamino]-3-oxopropanoate. 2089061-92-5 C17H17ClN2O3
Pregabalin Impurity 15 Pregabalin Impurity 15
Pregabalin Impurity 32 Pregabalin Impurity 32
4-Hydroxyphthalic Acid 4-Hydroxyphthalic Acid 501666-22-4 C14H25NO6
Axitinib Impurity 14 Axitinib Impurity 14
Nicorandil Impurity 7 Nicorandil Impurity 7
Ritonavir EP Impurity T Ritonavir EP Impurity T 869368-48-9 C46H66N8O5S2
4-Methoxy-a-methyl-L-phenylalanine 4-Methoxy-a-methyl-L-phenylalanine 65555-88-6 C11H15NO3
Cyanocobalamin Cyanocobalamin 38218-55-2 C63H87CoN13O15P
Empagliflozin Impurity 44 Empagliflozin Impurity 44
1,4,8,11- tetra(trifluoroacetyl)-1,4,8,11-tetraazacyclotetradecane 1,4,8,11- tetra(trifluoroacetyl)-1,4,8,11-tetraazacyclotetradecane 201610-16-4 C18H20F12N4O4
5-bromo-4-(4-chlorothiophen-2-yl)thiazol-2-amine 5-bromo-4-(4-chlorothiophen-2-yl)thiazol-2-amine 2161380-87-4 C7H4BrClN2S2
Zopiclone Impurity 11 Zopiclone Impurity 11
(3R,5S)-5-((R)-8-fluoro-4-isopropyl-2-(N-methylmethylsulfonam ido)-5,6-dihydrobenzo[h]quinazolin-6-yl)-3,5-dihydroxypentanoate calcium(II) (3R,5S)-5-((R)-8-fluoro-4-isopropyl-2-(N-methylmethylsulfonam ido)-5,6-dihydrobenzo[h]quinazolin-6-yl)-3,5-dihydroxypentanoate calcium(II) 854898-49-0 C44H54CaF2N6O12S2
Doxorubicin EP Impurity C HBr Doxorubicin EP Impurity C HBr 60873-68-9 C27H29Br2NO10
Ceftazidime Impurity K Ceftazidime Impurity K
Furosemide Impurity 3 Furosemide Impurity 3 C12H11ClN2O5S
Nicorandil Impurity 13 Nicorandil Impurity 13 19416-51-4 C9H11NO3
Rosuvastatin Impurity 51 Rosuvastatin Impurity 51
Silodosin Impurity 3 Silodosin Impurity 3 1402161-34-5 C29H31N3O2
Tenofovir Impurity 61 Tenofovir Impurity 61
Ticagrelor Impurity 70 Ticagrelor Impurity 70 1824025-11-7
Topiroxostat Impurity 21 Topiroxostat Impurity 21 2044704-74-5 C13H7N5O
Mirabegron Impurity 17 Mirabegron Impurity 17 1684452-84-3 C31H32N8O4S3
Afatinib Impurity 24 Afatinib Impurity 24
Amifostine Impurity 8 Amifostine Impurity 8 66487-25-0 C5H10N2O
Bendamustine Impurity 33 Bendamustine Impurity 33
Bendamustine Impurity 38 Bendamustine Impurity 38
Ciprofloxacin Impurity 4 Ciprofloxacin Impurity 4 C17H18FN3O3
Dapagliflozin Impurity 29 Dapagliflozin Impurity 29
Erlotinib Impurity 52 Erlotinib Impurity 52
Etoposide Impurity 3 Etoposide Impurity 3
Nintedanib Impurity 29 Nintedanib Impurity 29
Olaparib Impurity 23 Olaparib Impurity 23
Oseltamivir Impurity 19 Oseltamivir Impurity 19
Rocuronium bromide Impurity 30 Rocuronium bromide Impurity 30 56240-11-0 C19H26O
Rocuronium Bromide Impurity 38 Rocuronium Bromide Impurity 38
S-Silodosin S-Silodosin 2182279-45-2 C25H32F3N3O4
Terazosin EP Impurity D Terazosin EP Impurity D 102714-74-9 C15H19N5O3
Apremilast Impurity FA Apremilast Impurity FA 2077897-94-8 C21H22N2O7S
Atracurium Impurity S Atracurium Impurity S
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