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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Cefazolin Impurity 5 Cefazolin Impurity 5
Peramivir Impurity E Peramivir Impurity E
Lincomycin sulfoxide Impurity 3 Lincomycin sulfoxide Impurity 3
Lincomycin sulfoxide Impurity F Lincomycin sulfoxide Impurity F
Fasudil iMpurity F Fasudil iMpurity F
1-cyclopropyl-8-ethoxy-6-fluoro-7-((4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid hydrochloride 1-cyclopropyl-8-ethoxy-6-fluoro-7-((4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid hydrochloride 2252446-70-9 C22H27ClFN3O4
Doxofylline iMpurity E Doxofylline iMpurity E
Mupirocin Impurity 3 Mupirocin Impurity 3 C26H44O9
3,4-DICHLOROBENZYLAMINE HYDROCHLORIDE 3,4-DICHLOROBENZYLAMINE HYDROCHLORIDE 49552-34-3 C7H8Cl3N
2,3,5,6-tetradeuterio-4-[5-[4-(hydroxymethyl)phenyl]-3-(trifluoromethyl)pyrazol-1-yl]benzenesulfonamide 2,3,5,6-tetradeuterio-4-[5-[4-(hydroxymethyl)phenyl]-3-(trifluoromethyl)pyrazol-1-yl]benzenesulfonamide 1276524-56-1 C17H10D4F3N3O3S
1,1-diphenylpropan-1-ol 1,1-diphenylpropan-1-ol 5180-33-6 C15H16O
HERBACETIN-3,8-DIGLUCOPYRANOSIDE HERBACETIN-3,8-DIGLUCOPYRANOSIDE 99224-12-1 C27H30O17
ACETAMINOPURINE ACETAMINOPURINE 6034-68-0 C7H7N5O
2-(4-HYDROXY-PHENYL)-4-METHYL-THIAZOLE-5-CARBOXYLIC ACID 2-(4-HYDROXY-PHENYL)-4-METHYL-THIAZOLE-5-CARBOXYLIC ACID 886501-78-6 C11H9NO3S
Methyl-5-chlorothiophene-2-carboxylate Methyl-5-chlorothiophene-2-carboxylate 35475-03-7 C6H5ClO2S
(R)-3-((R)-5-(4-fluorophenyl)-5-hydroxypentanoyl)-4-phenyloxazolidin-2-one (R)-3-((R)-5-(4-fluorophenyl)-5-hydroxypentanoyl)-4-phenyloxazolidin-2-one 1612153-32-8 C20H20FNO4
(S)-3-((R)-5-(4-fluorophenyl)-5-hydroxypentanoyl)-4-phenyloxazolidin-2-one (S)-3-((R)-5-(4-fluorophenyl)-5-hydroxypentanoyl)-4-phenyloxazolidin-2-one 528565-93-7 C20H20FNO4
Posaconazole iMpurity 3 Posaconazole iMpurity 3
Bezafibrate Impurity D Bezafibrate Impurity D 41859-58-9 C21H24ClNO4
Cloxacillin Sodium EP Impurity B (Mixture of Diastereomers) Cloxacillin Sodium EP Impurity B (Mixture of Diastereomers) 1642559-64-5 C18H20ClN3O4S
Ezetimibe Related Impurity 37 Ezetimibe Related Impurity 37 204589-68-4 C24H19F2NO2
S, R-Isovalganciclovir Impurity S, R-Isovalganciclovir Impurity 1356932-18-7 C14H22N6O5
Sofosbuvir Impurity 8 Sofosbuvir Impurity 8 944476-44-2 C24H22N2O8
135270-13-2 135270-13-2 135270-13-2 C12H11F2N3O
1-((2'-cyanobiphenyl-4-yl)methyl)-4-methyl-2-propyl-1H-benzo[d]imidazole-6-carboxylic acid 1-((2'-cyanobiphenyl-4-yl)methyl)-4-methyl-2-propyl-1H-benzo[d]imidazole-6-carboxylic acid 1098100-87-8 C26H23N3O2
Fimasartan Impurity Fimasartan Impurity
2-(((5-(2-fluorophenyl)-1-(pyridin-3-ylsulfonyl)-1H-pyrrol-3-yl)methyl)(methyl)amino)succinic acid 2-(((5-(2-fluorophenyl)-1-(pyridin-3-ylsulfonyl)-1H-pyrrol-3-yl)methyl)(methyl)amino)succinic acid C21H20FN3O6S
()-Olivil 4″-O-glucoside ()-Olivil 4″-O-glucoside 76880-93-8 C26H34O12
2-(DIETHYLAMINO)-N-(2,4-DIMETHYLPHENYL)ACETAMIDE 2-(DIETHYLAMINO)-N-(2,4-DIMETHYLPHENYL)ACETAMIDE 17289-53-1 C14H22N2O
(3RS)-3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one (3RS)-3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one C16H20N2O
(R)-De(trifluoromethyl) Fluoxetine Hydrochloride (R)-De(trifluoromethyl) Fluoxetine Hydrochloride 1212215-97-8 C16H20ClNO
(1R,5S)-1-phenyl-3-oxabicyclo[3.1.0]hexan-2-one (1R,5S)-1-phenyl-3-oxabicyclo[3.1.0]hexan-2-one 96847-52-8 C11H10O2
(1R,1'R,2S,2'S)-2,2'-[1,5-pentanediylbis[oxy(3-oxo-3,1-propanediyl)]]bis[1-[(3,4-dimethoxyphenyl)methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-Isoquinolinium Benzenesulfonate (1R,1'R,2S,2'S)-2,2'-[1,5-pentanediylbis[oxy(3-oxo-3,1-propanediyl)]]bis[1-[(3,4-dimethoxyphenyl)methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-Isoquinolinium Benzenesulfonate 96946-46-2 C59H77N2O15S+
(2R,3R,4R,5R)-2-(4-amino-2-oxo-1,3,5-triazin-1(2H)-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-3-yl acetate (2R,3R,4R,5R)-2-(4-amino-2-oxo-1,3,5-triazin-1(2H)-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-3-yl acetate C10H14N4O6
12-ethyl-8-methyl-9-oxo-7-propionyl-9,11-dihydroindolizino[1,2-b]quinolin-2-yl [1,4'-bipiperidine]-1'-carboxylate 12-ethyl-8-methyl-9-oxo-7-propionyl-9,11-dihydroindolizino[1,2-b]quinolin-2-yl [1,4'-bipiperidine]-1'-carboxylate 176515-52-9 C32H38N4O4
4-amino-5-chloro-N-(1-propylpiperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 4-amino-5-chloro-N-(1-propylpiperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide C17H24ClN3O2
Ceftazidime Impurity D Ceftazidime Impurity D
Ceftazidime Sulfoxide Impurity Ceftazidime Sulfoxide Impurity
Tofacitinib Impurity Y Tofacitinib Impurity Y
5-amino-6-chloro-2-(propylthio)pyrimidin-4-ol 5-amino-6-chloro-2-(propylthio)pyrimidin-4-ol C7H10ClN3OS
Labetalol EP impurity G Labetalol EP impurity G
2-(2-NITROPHENYL)ETHANAMINE 2-(2-NITROPHENYL)ETHANAMINE 33100-15-1 C8H10N2O2
CLOZAPINE-D3 CLOZAPINE-D3 1215691-72-7 C18H19ClN4
Bumetanide iMpurity F Bumetanide iMpurity F
IODIXANOL RELATED COMPOUND D (50 MG) (5-[ACETYL(2-HYDROXY-3-METHYLPROPYL)AMINO]-N,N'-BIS(2,3-DIHYDROXYPROPYL)2,4,6-TRIIODO-1,3-BENZE-NEDICARBOXAMIDE) IODIXANOL RELATED COMPOUND D (50 MG) (5-[ACETYL(2-HYDROXY-3-METHYLPROPYL)AMINO]-N,N'-BIS(2,3-DIHYDROXYPROPYL)2,4,6-TRIIODO-1,3-BENZE-NEDICARBOXAMIDE) 89797-00-2 C20H28I3N3O9
NIMODIPINE RELATED COMPOUND B (50 MG) (BIS(2-METHOXYETHYL) 2,6-DIMETHYL-4-(3-NITROPHE-NYL)-1,4-DIHYDROPYRIDINE-3,5-DICARBOXYLATE) (AS) NIMODIPINE RELATED COMPOUND B (50 MG) (BIS(2-METHOXYETHYL) 2,6-DIMETHYL-4-(3-NITROPHE-NYL)-1,4-DIHYDROPYRIDINE-3,5-DICARBOXYLATE) (AS) 70172-96-2 C21H26N2O8
1-METHYL-2-PHENOXYETHYLAMINE 1-METHYL-2-PHENOXYETHYLAMINE 35205-54-0 C9H13NO
SULPIRIDE IMPURITY B SULPIRIDE IMPURITY B
(2R,4S)-Isopropyl 5-([1,1''-biphenyl]-4-yl)-4-(4-isopropoxy-4-oxobutanamido)-2-methylpentanoate (2R,4S)-Isopropyl 5-([1,1''-biphenyl]-4-yl)-4-(4-isopropoxy-4-oxobutanamido)-2-methylpentanoate 2216755-67-6 C28H37NO5
1,2-Dihydro Diethyl Loteprednol Carbonate 1,2-Dihydro Diethyl Loteprednol Carbonate 82048-81-5 C26H36O9
Nilotinib 3-Imidazolyl N-oxide Nilotinib 3-Imidazolyl N-oxide 2139382-75-3 C28H22F3N7O2
α,α''-[(Methylimino)di-2,1-ethanediyl]bis-benzenemethanol α,α''-[(Methylimino)di-2,1-ethanediyl]bis-benzenemethanol 857786-66-4 C19H25NO2
sodium 5-methoxy-2-sulfinatobenzo[d]imidazol-1-id sodium 5-methoxy-2-sulfinatobenzo[d]imidazol-1-id
Pramipexole 828 Impurity Pramipexole 828 Impurity
E-Ceftazidime Oxide Impurity E-Ceftazidime Oxide Impurity
Cefuroxime Impurity D Δ3-Isomer Cefuroxime Impurity D Δ3-Isomer
Ampicillin Open-Ring Formylation Impurity Ampicillin Open-Ring Formylation Impurity
Faropenem Degradation Impurity A Faropenem Degradation Impurity A
2-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propanoic acid 2-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propanoic acid
Eribulin Impurity 2 Eribulin Impurity 2
(2S)-dimethyl 2-(4-(4-oxobutan-2-yl)benzamido)pentanedioate (2S)-dimethyl 2-(4-(4-oxobutan-2-yl)benzamido)pentanedioate
(E)-1-(2,4-difluorostyryl)-1H-1,2,4-triazole (E)-1-(2,4-difluorostyryl)-1H-1,2,4-triazole
Peramivir Impurity 22 Peramivir Impurity 22
Olaparib Impurity 58 Olaparib Impurity 58 848136-41-4 C22H21FN4O3
Fluconazole Impurity 4 Fluconazole Impurity 4 168479-96-7 C10H7F2N3O
Roxatidine Impurity 7 Roxatidine Impurity 7 876497-65-3 C7H6N2O2
Sparfloxacin Impurity Sparfloxacin Impurity 126457-99-6 C19H21F2N3O3
Peramivir Impurity 39 Peramivir Impurity 39
Imatinib impurity 39 Imatinib impurity 39
7-(4-BROMOBUTOXY)-QUINOLINE-2(1H)-ONE 7-(4-BROMOBUTOXY)-QUINOLINE-2(1H)-ONE 203395-59-9 C13H14BrNO2
DESMETHYL ATOMOXETINE HYDROCHLORIDE DESMETHYL ATOMOXETINE HYDROCHLORIDE 881995-46-6 C16H19NO.ClH
2-HYDROXY-5-BENZYLOXYACETOPHENONE 2-HYDROXY-5-BENZYLOXYACETOPHENONE 30992-63-3 C15H14O3
2-[(4-METHOXY-3-METHYL-2-PYRIDINYL)-METHYLTHIO]-BENZIMIDAZOLE 2-[(4-METHOXY-3-METHYL-2-PYRIDINYL)-METHYLTHIO]-BENZIMIDAZOLE 102804-82-0 C15H15N3OS
2-[(4-METHYLPIPERAZIN-1-YL)METHYL]BENZONITRILE 2-[(4-METHYLPIPERAZIN-1-YL)METHYL]BENZONITRILE 864069-00-1 C13H17N3
Afatinib impurity 84 Afatinib impurity 84
Sugammadex sodium Impurity 40 Sugammadex sodium Impurity 40
Sugammadex sodium Impurity 44 Sugammadex sodium Impurity 44
Sugammadex sodium Impurity 49 Sugammadex sodium Impurity 49
Cefazolin Impurity EP-E Cefazolin Impurity EP-E
Canagliflozin Impurity 70 Canagliflozin Impurity 70
Dapoxetine impurity 66 Dapoxetine impurity 66
EP Impurity Catalog EP Impurity Catalog
2,3'-Bipyridine, 5-chloro-3-[4-(methylsulfonyl)phenyl]-, hydrochloride (1:1) 2,3'-Bipyridine, 5-chloro-3-[4-(methylsulfonyl)phenyl]-, hydrochloride (1:1) 202409-39-0 C17H14Cl2N2O2S
1,1'-((methylenebis(4-methoxy-3,1-phenylene))bis(2-(dimethylamino)ethane-1,1-diyl))dicyclohexanol 1,1'-((methylenebis(4-methoxy-3,1-phenylene))bis(2-(dimethylamino)ethane-1,1-diyl))dicyclohexanol
2-amino-4-(2-(benzyl(1-(4-methoxyphenyl)propan-2-yl)amino)-1-hydroxyethyl)phenol 2-amino-4-(2-(benzyl(1-(4-methoxyphenyl)propan-2-yl)amino)-1-hydroxyethyl)phenol
NA NA
Empagliflozin Impurity 116 Empagliflozin Impurity 116
(3R,5aS)-5,8-dioxooctahydro-5H-pyrrolo[1,2-a]thiazolo[3,2-d]pyrazine-3-carboxylic acid (3R,5aS)-5,8-dioxooctahydro-5H-pyrrolo[1,2-a]thiazolo[3,2-d]pyrazine-3-carboxylic acid
Phospholipid Impurity 1(DPPE-MPEG5000 Impurity 1) Phospholipid Impurity 1(DPPE-MPEG5000 Impurity 1)
Carbazochrome Sodium Sulfonate Impurity 4 Carbazochrome Sodium Sulfonate Impurity 4
Empagliflozin Furanose Impurity Empagliflozin Furanose Impurity
Rosuvastatin Impurity 144 Rosuvastatin Impurity 144
Cetrorelix Impurity 11 Cetrorelix Impurity 11
Cetrorelix Impurity 4 (8-D-Arg) Cetrorelix Impurity 4 (8-D-Arg)
Cetrorelix Impurity 1 (+L-Arg) Cetrorelix Impurity 1 (+L-Arg)
Peramivir Intermediate Impurity 36 Peramivir Intermediate Impurity 36
Peramivir Intermediate Impurity 41 Peramivir Intermediate Impurity 41
Peramivir Impurity 999 Peramivir Impurity 999
Palonosetron impurity 20XH Palonosetron impurity 20XH
Apixaban Impurity 89 Apixaban Impurity 89
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