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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
2(RS)-4-Methyl-1-(3-Methylpyridin-2-yl)-2-phenylpiperazine 2(RS)-4-Methyl-1-(3-Methylpyridin-2-yl)-2-phenylpiperazine 191546-94-8 C17H21N3
Iso Ganciclovir Iso Ganciclovir 86357-09-7 C9H13N5O4
(1S,3R)-1-Benzo[1,3]dioxol-5-yl-2-(2-chloro-acetyl)-2,3,4,9-tetrahydro-1H-b-carboline-3-carboxylic Acid Methyl Ester (1S,3R)-1-Benzo[1,3]dioxol-5-yl-2-(2-chloro-acetyl)-2,3,4,9-tetrahydro-1H-b-carboline-3-carboxylic Acid Methyl Ester 629652-40-0 C22H19ClN2O5
2-Butyl-1,6-dihydro-N,N,4-trimethyl-6-oxo-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-5-pyrimidineacetamide 2-Butyl-1,6-dihydro-N,N,4-trimethyl-6-oxo-1-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-5-pyrimidineacetamide 503155-67-7 C46H45N7O2
O-De(3-fluorobenzyl) Lapatinib O-De(3-fluorobenzyl) Lapatinib 1268997-70-1 C22H21ClN4O4S
5-Des[2-(tert-butylaMino)] BaMbuterol-5-ethylenediol 5-Des[2-(tert-butylaMino)] BaMbuterol-5-ethylenediol 112935-92-9 C14H20N2O6
Desloratadine Epoxide Desloratadine Epoxide 1346604-23-6 C19H19ClN2O
Menaquinone 4 2,3-Epoxide Menaquinone 4 2,3-Epoxide 72908-86-2 C31H40O3
D-Phenylalanyl Nateglinide D-Phenylalanyl Nateglinide 944746-48-9 C28H36N2O4
Felodipine 3,5-DiMethyl Ester Felodipine 3,5-DiMethyl Ester 91189-59-2 C17H17Cl2NO4
Moxifloxacin Methyl Ester Moxifloxacin Methyl Ester 721970-35-0 C22H26FN3O4
Atomoxetine Related Compound C (10 mg) (N-methyl-3-phenyl-3-(p-tolyloxy)propan-1-amine hydrochloride) Atomoxetine Related Compound C (10 mg) (N-methyl-3-phenyl-3-(p-tolyloxy)propan-1-amine hydrochloride) 873310-31-7 C17H22ClNO
Dofetilide Related Compound A (25 mg) (N-[4-(2-(2-[4-(methanesulfonamido)phenoxy]ethyl)amino)phenyl]methanesulfonamide) Dofetilide Related Compound A (25 mg) (N-[4-(2-(2-[4-(methanesulfonamido)phenoxy]ethyl)amino)phenyl]methanesulfonamide) 176447-94-2 C18H25N3O5S2
5-Methyl-2-(1H-1,2,3-triazol-1-yl)benzoic acid 5-Methyl-2-(1H-1,2,3-triazol-1-yl)benzoic acid 1149352-55-5 C10H9N3O2
9-ethyl-8-iodo-6,6-diMethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile 9-ethyl-8-iodo-6,6-diMethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile 1256584-80-1 C21H17IN2O
9-ethyl-8-iodo-6,6-diMethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile 9-ethyl-8-iodo-6,6-diMethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile 1256584-80-1 C21H17IN2O
Palonosetron Impurity 7 Palonosetron Impurity 7 177932-92-2 C18H24N2O
4-(2,3-Dichlorophenyl)-2,6-diMethyl-1,4-dihydropyridine-3,5-dicarboxylic acid 4-(2,3-Dichlorophenyl)-2,6-diMethyl-1,4-dihydropyridine-3,5-dicarboxylic acid 138279-32-0 C15H13Cl2NO4
4-(4-fluoro-3-(piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one 4-(4-fluoro-3-(piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one 763111-47-3 C20H19FN4O2
IRBESARTAN RELATED COMPOUND A (25 MG) (1-PENTANOYLAMINO-CYCLOPENTANECARBOXYLIC ACID [2'-(1H-TETRAZOL-5-YL)-BIPHENYL-4-YLMETHYL]-AMIDE) IRBESARTAN RELATED COMPOUND A (25 MG) (1-PENTANOYLAMINO-CYCLOPENTANECARBOXYLIC ACID [2'-(1H-TETRAZOL-5-YL)-BIPHENYL-4-YLMETHYL]-AMIDE) 748812-53-5 C25H30N6O2
FENOFIBRATE RELATED COMPOUND C (25 MG) (1-METHYLETHYL 2-[[2-[4-(4-CHLOROBENZOYL)PHENOXY]-2-METHYLPROPANOYL]OXY]-2-METHYLPROPANOATE) FENOFIBRATE RELATED COMPOUND C (25 MG) (1-METHYLETHYL 2-[[2-[4-(4-CHLOROBENZOYL)PHENOXY]-2-METHYLPROPANOYL]OXY]-2-METHYLPROPANOATE) 217636-48-1 C24H27ClO6
4-(DIPHENYLMETHYL)-1-PIPERAZINEETHANOL DIHYDROCHLORIDE 4-(DIPHENYLMETHYL)-1-PIPERAZINEETHANOL DIHYDROCHLORIDE 108983-83-1 C19H26Cl2N2O
2-Piperazine-4-amino-6,7-dimethoxyquinazoline 2-Piperazine-4-amino-6,7-dimethoxyquinazoline 60547-97-9 C14H19N5O2
N-ACETYL-4-BENZOQUINONE IMINE N-ACETYL-4-BENZOQUINONE IMINE 50700-49-7 C8H7NO2
DIGOXIGENIN-TETRA-DIGITOXOSIDE DIGOXIGENIN-TETRA-DIGITOXOSIDE 31539-05-6 C47H74O17
Afatinib impurity 82 Afatinib impurity 82
Afatinib impurity 82 Afatinib impurity 82
Sugammadex sodium Impurity 51 Sugammadex sodium Impurity 51
Sugammadex sodium Impurity 42 Sugammadex sodium Impurity 42
Org49095 Org49095 2412952-95-3 C71H111NaO48S8
Clopidogrel Impurity 55 Clopidogrel Impurity 55
Cabozantinib impurity 43 Cabozantinib impurity 43
Cabozantinib impurity 75 Cabozantinib impurity 75
Cabozantinib impurity 73 Cabozantinib impurity 73
Canagliflozin Impurity 69 Canagliflozin Impurity 69
Dapoxetine impurity 65 Dapoxetine impurity 65
Dapoxetine impurity 59 Dapoxetine impurity 59
Ganciclovir EP Impurity Ganciclovir EP Impurity
Crisaborole Impurity 15 Crisaborole Impurity 15
Latamoxef impurity A Latamoxef impurity A
5,8-Dihydroxy-1,4-bis-[2-(2-hydroxy-ethylamino)-ethylamino]-2,3-dihydro-anthraquinone 5,8-Dihydroxy-1,4-bis-[2-(2-hydroxy-ethylamino)-ethylamino]-2,3-dihydro-anthraquinone 70476-74-3 C22H30N4O6
(E)-methyl 3-(((4-(N-methyl-2-(4-methylpiperazin-1-yl)acetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate (E)-methyl 3-(((4-(N-methyl-2-(4-methylpiperazin-1-yl)acetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate
4-Acetyl-2-fluorobiphenyl 4-Acetyl-2-fluorobiphenyl 42771-79-9 C14H11FO
m-xylene-4,alpha,alpha'-triol m-xylene-4,alpha,alpha'-triol 2937-60-2 C8H10O3
Oseltamivir Impurity 107 Oseltamivir Impurity 107
Oseltamivir Impurity 66 Oseltamivir Impurity 66
Tazobactam Impurity DBT Tazobactam Impurity DBT
diginatin diginatin 52589-12-5 C41H64O15
Thiophene, 2-(2-fluorophenyl)-5-[(5-iodo-2-methylphenyl)methyl]- Thiophene, 2-(2-fluorophenyl)-5-[(5-iodo-2-methylphenyl)methyl]- 2436275-33-9 C18H14FIS
3-Chloro Avanafil 3-Chloro Avanafil
Revefenacin Impurity 2 Revefenacin Impurity 2 1158699-78-5 C14H17NO4
(R)-2-(4-Methoxyphenyl)-1-methylethanamine (R)-2-(4-Methoxyphenyl)-1-methylethanamine 58993-79-6 C10H15NO
N-[5-[(1RS)-2-[benzyl[(1RS)-2-(4-methoxyphenyl)- 1-methylethyl]amino]-1-hydroxyethyl]-2- hydroxyphenyl]formamide N-[5-[(1RS)-2-[benzyl[(1RS)-2-(4-methoxyphenyl)- 1-methylethyl]amino]-1-hydroxyethyl]-2- hydroxyphenyl]formamide 2514947-17-0 C26H30N2O4
IMp. A (EP) as Hydrochloride: 3-[[[2-[(DiaMinoMethylene)aMino]thiazol-4-yl]- Methyl]sulphanyl]propaniMidaMide Hydrochloride IMp. A (EP) as Hydrochloride: 3-[[[2-[(DiaMinoMethylene)aMino]thiazol-4-yl]- Methyl]sulphanyl]propaniMidaMide Hydrochloride
Peramivir dehydrated deacetylated impurity Peramivir dehydrated deacetylated impurity
Cilastatin Impurity H Cilastatin Impurity H
(trans, trans)-3,3'-(1,4,7,10-tetraazacyclododecane-1,7-diyl)bis(butane-1,2,4-triol) (trans, trans)-3,3'-(1,4,7,10-tetraazacyclododecane-1,7-diyl)bis(butane-1,2,4-triol)
Azelastine Impurity K Azelastine Impurity K
(4R,6R)-6-(2-((1S,2S)-2,6-dimethyl-1,2,3,4-tetrahydronaphthalen-1- (4R,6R)-6-(2-((1S,2S)-2,6-dimethyl-1,2,3,4-tetrahydronaphthalen-1-
Carbazochrome Sodium Sulfonate Impurity 1 Carbazochrome Sodium Sulfonate Impurity 1
Rosuvastatin Impurity 147 Rosuvastatin Impurity 147
Febuxostat Impurity 15 Complete Set Febuxostat Impurity 15 Complete Set
Cetrorelix Impurity 10 Cetrorelix Impurity 10
Cetrorelix Impurity 3 (9-D-Pro) Cetrorelix Impurity 3 (9-D-Pro)
Peramivir Intermediate Impurity 42 Peramivir Intermediate Impurity 42
Nintedanib impurity A drops Nintedanib impurity A drops
Tofacitinib impurity N drops Tofacitinib impurity N drops
Carboprost impurity 999 Carboprost impurity 999
Bumetanide impurity C drops Bumetanide impurity C drops
Apixaban Impurity 79 Apixaban Impurity 79
Troxipide Impurity 6 Troxipide Impurity 6
Piperacillin Impurity K Piperacillin Impurity K
2-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzoic acid 2-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzoic acid
3-Thiophenecarboxylic acid, 4-methyl-5-(4-nitrophenyl)-2-[(propoxycarbonyl)amino]-, ethyl ester 3-Thiophenecarboxylic acid, 4-methyl-5-(4-nitrophenyl)-2-[(propoxycarbonyl)amino]-, ethyl ester 2591260-03-4 C18H20N2O6S
Pemetrexed disodium Impurity 32 Pemetrexed disodium Impurity 32
Androsta-1,4-diene-17-carboxylic acid, 11,16,17-trihydroxy-3-oxo-, (11β,16α,17α)- Androsta-1,4-diene-17-carboxylic acid, 11,16,17-trihydroxy-3-oxo-, (11β,16α,17α)- 1185143-75-2 C20H26O6
(3R,5R)-7-(1-((3R,5R)-6-carboxy-3,5-dihydroxyhexyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrole-3-carboxamido)-3,5-dihydroxyheptanoic acid (3R,5R)-7-(1-((3R,5R)-6-carboxy-3,5-dihydroxyhexyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrole-3-carboxamido)-3,5-dihydroxyheptanoic acid
Tazobactam Impurity LTE Tazobactam Impurity LTE
Isavuconazole Impurity 47 Isavuconazole Impurity 47
5,5'-((1R,1'R)-((5,6-diethyl-2,3-dihydro-1H-inden-2-yl)azanediyl)bis(1-hydroxyethane-2,1-diyl))bis(8-(benzyloxy)quinolin-2(1H)-one) 5,5'-((1R,1'R)-((5,6-diethyl-2,3-dihydro-1H-inden-2-yl)azanediyl)bis(1-hydroxyethane-2,1-diyl))bis(8-(benzyloxy)quinolin-2(1H)-one) 753498-27-0 C49H49N3O6
2-((6S,8S,9S,10R,11S,13S,14S,17S)-11-hydroxy-6,10,13-trimethyl-3-oxo- 6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoacetic acid 2-((6S,8S,9S,10R,11S,13S,14S,17S)-11-hydroxy-6,10,13-trimethyl-3-oxo- 6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoacetic acid
Eltrombopag Impurity 37 Eltrombopag Impurity 37 350024-70-3 C14H18N2O
(S)-N-(2-(1-(3-ethoxy-4-methoxyphenyl)-2-((2-hydroxyethyl)sulfonyl)ethyl)-1,3-dioxoisoindolin-4-yl)acetamide (S)-N-(2-(1-(3-ethoxy-4-methoxyphenyl)-2-((2-hydroxyethyl)sulfonyl)ethyl)-1,3-dioxoisoindolin-4-yl)acetamide C23H26N2O8S
2-(4-(2-(4-(1-(2-ethoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropan-1-ol 2-(4-(2-(4-(1-(2-ethoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropan-1-ol C28H39N3O2
Tafluprost Impurity 20 Tafluprost Impurity 20
Rosuvastatin Impurity 149 Rosuvastatin Impurity 149
2-CHLOROMETHYL-5-TRIFLUOROMETHYL-[1,3,4]OXADIAZOLE 2-CHLOROMETHYL-5-TRIFLUOROMETHYL-[1,3,4]OXADIAZOLE 723286-98-4 C4H2ClF3N2O
Rifampicin Quinone Oxide Rifampicin Quinone Oxide
1-(2-(4-(((2-(4-(([1,1'-biphenyl]-2-ylcarbamoyl)oxy)piperidin-1-yl)ethyl)(methyl)amino)methyl)-N-methylbenzamido)ethyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate 1-(2-(4-(((2-(4-(([1,1'-biphenyl]-2-ylcarbamoyl)oxy)piperidin-1-yl)ethyl)(methyl)amino)methyl)-N-methylbenzamido)ethyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate
1-Phenyl-3,4-dihydroisoquinoline 1-Phenyl-3,4-dihydroisoquinoline 52250-50-7 C15H13N
Pyrazinecarboxamide, 3,6-difluoro- (9CI) Pyrazinecarboxamide, 3,6-difluoro- (9CI) 356783-29-4 C5H3F2N3O
Benzamide, 3-hydrazino- (9CI) Benzamide, 3-hydrazino- (9CI) 473927-51-4 C7H9N3O
4-[5-({2-[(4-{5-[Bis(2-chloroethyl)amino]-1-methyl-1H-benzimidazol-2-yl}butanoyl)oxy]ethyl}(2-chloroethyl)amino)-1-methyl-1H benzimidazol-2-yl]butanoic acid 4-[5-({2-[(4-{5-[Bis(2-chloroethyl)amino]-1-methyl-1H-benzimidazol-2-yl}butanoyl)oxy]ethyl}(2-chloroethyl)amino)-1-methyl-1H benzimidazol-2-yl]butanoic acid 1926162-37-9 C32H42Cl4N6O4
Isavuconazole Impurity 39 Isavuconazole Impurity 39 207224-73-5 C21H18F2N4OS
Anastrozole Impurity 41 Anastrozole Impurity 41
Anastrozole Impurity 41 Anastrozole Impurity 41
Isavuconazole Impurityi45 Isavuconazole Impurityi45
Gatifloxacinacid Gatifloxacinacid 121577-32-0 C19H22FN3O4.ClH
Bisoprolol Impurity 41 Bisoprolol Impurity 41
1,4-Naphthalenedione, 2-(3-hydroxy-3,7,11,15-tetramethyl-1,6,10,14-hexadecatetraenyl)-3-methyl-, (,E,E)- (9CI) 1,4-Naphthalenedione, 2-(3-hydroxy-3,7,11,15-tetramethyl-1,6,10,14-hexadecatetraenyl)-3-methyl-, (,E,E)- (9CI) 65061-22-5 C31H40O3
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