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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
5-[bis-(2-Chloroethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester 5-[bis-(2-Chloroethyl)amino]-1-methyl-1H-benzimidazole-2-butanoic acid ethyl ester 87475-54-5 C18H25Cl2N3O2
6-Hydroxykaempferol 3-Rutinoside -6-glucoside 6-Hydroxykaempferol 3-Rutinoside -6-glucoside 145134-63-0 C33H40O21
(R)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline (R)-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline 85-63-2 C21H27NO4
Linagliptin Impurity P Linagliptin Impurity P
Linagliptin Impurity U Linagliptin Impurity U
(R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzoic acid (R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzoic acid 1917324-15-2 C18H21FN4O4
N1,N4-bis((R)-1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)succinamide N1,N4-bis((R)-1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)succinamide C40H42F2N10O6
ethyl ((1R,3aR,4aR,6S,8aR,9S,9aS)-9-((E)-2-(5-(3-fluorophenyl)pyridin-2-yl)vinyl)-1-methyl-3-oxododecahydronaphtho[2,3-c]furan-6-yl)carbamate ethyl ((1R,3aR,4aR,6S,8aR,9S,9aS)-9-((E)-2-(5-(3-fluorophenyl)pyridin-2-yl)vinyl)-1-methyl-3-oxododecahydronaphtho[2,3-c]furan-6-yl)carbamate 618385-10-7 C29H33FN2O4
(2R)-2-deoxy-2-fluoro-2-methyl-α/β-D-erythro-pentofuranosyl chloride-3,5-dibenzoate (2R)-2-deoxy-2-fluoro-2-methyl-α/β-D-erythro-pentofuranosyl chloride-3,5-dibenzoate 1621160-31-3 C20H18ClFO5
Apremilast Impurity F Apremilast Impurity F
Etoricoxib Impurity 17 Etoricoxib Impurity 17
Ibrutinib Impurity 3 Ibrutinib Impurity 3 1226872-27-0 C25H26N6O4
Imatinib Impurity 2 Imatinib Impurity 2 1384131-91-2 C7H11NO
Mirabegron M5 (YM-538852) Mirabegron M5 (YM-538852) 1365244-63-8 C18H22N2O2
Sofosbuvir Impurity 6 Sofosbuvir Impurity 6
Vonoprazan Impurity 2 Vonoprazan Impurity 2 881733-36-4 C17H16FN3O2S
Atomoxetine EP impurity A Atomoxetine EP impurity A 56161-70-7 C16H19NO
Cinacalcet Impurity 21 Cinacalcet Impurity 21
Dasatinib Impurity D Dasatinib Impurity D
Doxofylline Impurity 1 Doxofylline Impurity 1 1429636-74-7 C10H16N4O3
Isopropyl4-hydroxy-3,5-diisopropylbenzoate Isopropyl4-hydroxy-3,5-diisopropylbenzoate 2095678-97-8 C16H24O3
Sitagliptin EP Impurity B Sitagliptin EP Impurity B 1345822-87-8 C16H19F5N5O5P
Trospium Impurity Trospium Impurity
Vildagliptin Related Compound A Vildagliptin Related Compound A 741657-02-3 C17H25N3O
2-amino-9-((1R,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-one hydrate 2-amino-9-((1R,3R,4S)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-one hydrate 1367369-78-5 C12H15N5O3
Moxifloxacin Impurity 6 Moxifloxacin Impurity 6 849770-49-6 C25H29BFN3O8
Sitafloxacin Impurity A Sitafloxacin Impurity A 500295-83-0 C16H16FN3O3
1-benzylpiperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate 1-benzylpiperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate 171723-80-1 C25H26N2O2
Merariveron impurity C Merariveron impurity C
4H-Inden-4-one, 1-[1,5-dimethyl-5-[(triethylsilyl)oxy]hexyl]octahydro-7a-methyl-, [1R-[1α(R*),3aβ,7aα]]- 4H-Inden-4-one, 1-[1,5-dimethyl-5-[(triethylsilyl)oxy]hexyl]octahydro-7a-methyl-, [1R-[1α(R*),3aβ,7aα]]- 144848-24-8 C24H46O2Si
Cefazoline Impurity A Cefazoline Impurity A
Rifaximin impurity A Rifaximin impurity A
4,5,6,7-Tetrahydro-thieno[3,2-c]pyridin-2-ol 2-acetate 4,5,6,7-Tetrahydro-thieno[3,2-c]pyridin-2-ol 2-acetate 1151904-85-6 C9H11NO2S
ethyl (R)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate ethyl (R)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate 110548-06-6 C15H13F2NO4
methyl (Z)-3-(((4-(2-(4-(2-((4-((((Z)-6-(methoxymethyl)-2-oxoindolin-3-ylidene)(phenyl)methyl)amino)phenyl)(methyl)amino)-2-oxoethyl)piperazin-1-yl)-N-methylacetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate methyl (Z)-3-(((4-(2-(4-(2-((4-((((Z)-6-(methoxymethyl)-2-oxoindolin-3-ylidene)(phenyl)methyl)amino)phenyl)(methyl)amino)-2-oxoethyl)piperazin-1-yl)-N-methylacetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate 2097505-01-4 C56H54N8O7
Roxithromycin EP Impurity J Roxithromycin EP Impurity J 134834-12-1 C40H73ClN2O14
Venlafaxine D6 Venlafaxine D6 940297-06-3 C17H27NO2
Levosimendan Impurity 3 Levosimendan Impurity 3
Sofosbuvir Impurity29 Sofosbuvir Impurity29
Acarbose Impurity A Acarbose Impurity A
Levosimendan Impurity 1 Levosimendan Impurity 1 1643439-59-1 C22H23N7O2
Atomoxetine EP Impurity F Atomoxetine EP Impurity F
Quetiapine EP Impurity Q Quetiapine EP Impurity Q
Cefoxitin Impurity Cefoxitin Impurity
Acemetacin Impurity Acemetacin Impurity
ethyl (S)-6,7,8-trifluoro-1-(1-hydroxypropan-2-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylate ethyl (S)-6,7,8-trifluoro-1-(1-hydroxypropan-2-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylate 110548-03-3 C15H14F3NO4
ethyl (E)-2-(2-(4-methoxyphenyl)hydrazono)propanoate ethyl (E)-2-(2-(4-methoxyphenyl)hydrazono)propanoate 4792-57-8 C12H16N2O3
ACT 373898 ACT 373898 1433875-14-9 C15H17BrN4O5S
Reaxys ID: 3623864 Reaxys ID: 3623864 129385-61-1 C17H10ClNO3
Olaparib Impurity D Olaparib Impurity D
1-methylpyrrolidin-3-yl 2-(cyclopentyloxy)-2-phenylacetate 1-methylpyrrolidin-3-yl 2-(cyclopentyloxy)-2-phenylacetate C18H25NO3
Cabozantinib impurity A Cabozantinib impurity A
Loratadine Impurity 2 Loratadine Impurity 2 C22H23ClN2O2
Metoprolol Impurity 1 Metoprolol Impurity 1 C15H25NO3
Pitavastatin Impurity 1 Pitavastatin Impurity 1
Trifluridine Impurity 3 Trifluridine Impurity 3
Vonoprazan Impurity 1 Vonoprazan Impurity 1
Vonoprazan Impurity 4 Vonoprazan Impurity 4
Cinacalcet impurity K Cinacalcet impurity K
Valsartan Impurity 13 Valsartan Impurity 13 C24H29N5O3
Valsartan Impurity 27 Valsartan Impurity 27 C24H29N5O3
Etoricoxib Impurity 6 Etoricoxib Impurity 6
Ezetimibe impurity 3 Ezetimibe impurity 3
Apremilast Impurity C Apremilast Impurity C
bis(1-benzylpiperidin-3-yl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate bis(1-benzylpiperidin-3-yl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 166808-97-5 C16H16N2O6
Ticagrelor Imp.J Ticagrelor Imp.J 2248538-63-6 C14H20ClN5O4S
Vortioxetine Imp.E Vortioxetine Imp.E 508233-77-0 C18H22N2S
(3R,4S)-1-(4-fluorophenyl)-3-((S)-3-hydroxy-3-(p-tolyl)propyl)-4-(4-hydroxyphenyl)azetidin-2-one (3R,4S)-1-(4-fluorophenyl)-3-((S)-3-hydroxy-3-(p-tolyl)propyl)-4-(4-hydroxyphenyl)azetidin-2-one 1700622-07-6 C25H24FNO3
Topiroxostat Impurity 1 Topiroxostat Impurity 1
Oxcarbazepine Impurity3 Oxcarbazepine Impurity3
Mosapride IMP Mosapride IMP
4-Ethoxy Paroxetine 4-Ethoxy Paroxetine 606968-04-1 C21H25NO4
Methylene-Bis Paroxetine Methylene-Bis Paroxetine 1292846-10-6 C39H40F2N2O6
Trelagliptin Impurity X Trelagliptin Impurity X 1938080-44-4 C18H22FN5O3
Afatinib Impurity 19 Afatinib Impurity 19 1245555-42-3 C21H21ClFN5O2
Cefoxitin Sodium impurity Cefoxitin Sodium impurity
(1S,2S,3S)-Aprepitant (1S,2S,3S)-Aprepitant 1242175-40-1 C23H21F7N4O3
2-{[(methoxycarbonylmethyl)(toluene-4-sulfonyl)amino]methyl}-4-phenoxybenzoic acid methyl ester 2-{[(methoxycarbonylmethyl)(toluene-4-sulfonyl)amino]methyl}-4-phenoxybenzoic acid methyl ester 1455091-06-1 C25H25NO7S
Nicorandil Impurity E Nicorandil Impurity E
Prednicarbate Impurity G Prednicarbate Impurity G
Anastrozole iMpurity F Anastrozole iMpurity F
Ondansetron IMpurity 6 Ondansetron IMpurity 6
MeropeneM iMpurity 6 MeropeneM iMpurity 6
Macitentan Impurity 33 Macitentan Impurity 33 2089065-77-8 C28H32Br2N8O6S2
Cefminox Impurity 5 Cefminox Impurity 5
Alogliptin Impurity 20 Alogliptin Impurity 20
Cyclobenzaprine Impurity 3 Cyclobenzaprine Impurity 3 24167-44-0 C15H11BrO
Emtricitabine Impurity 16 Emtricitabine Impurity 16 1160303-44-5 C8H10FN3O4S
Etoricoxib Impurity 44 Etoricoxib Impurity 44
Irbesartan Impurity 15 Irbesartan Impurity 15 C25H28N6O
Linagliptin Impurity 54 Linagliptin Impurity 54
Ornidazole Impurity 13 Ornidazole Impurity 13 1685275-23-3
Oseltamivir Impurity 44 Oseltamivir Impurity 44
Oseltamivir Impurity 51 Oseltamivir Impurity 51
Palbociclib Impurity 47 Palbociclib Impurity 47
Rosuvastatin Impurity 98 Rosuvastatin Impurity 98
Sildenafil Impurity 38 Sildenafil Impurity 38 C22H30N6O4S
Tenofovir Impurity 70 Tenofovir Impurity 70
Ticagrelor Impurity 122 Ticagrelor Impurity 122
Tofacitinib Impurity 111 Tofacitinib Impurity 111 2374700-37-3 C27H31N5O2S
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