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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Bendamustine Impurity 37A Bendamustine Impurity 37A
Brivaracetam Impurity 50 Brivaracetam Impurity 50
6-Hydroxymoxifloxacin Impurities 6-Hydroxymoxifloxacin Impurities
(S)-4-(((R)-1-carboxy-2-((3-hydroxypropyl)thio)ethyl)amino)-3-hydroxy-4-oxobutanoic acid (S)-4-(((R)-1-carboxy-2-((3-hydroxypropyl)thio)ethyl)amino)-3-hydroxy-4-oxobutanoic acid
1,3-bis(5-bromo-2-methoxyphenyl)adamantane 1,3-bis(5-bromo-2-methoxyphenyl)adamantane 932033-56-2 C24H26Br2O2
(S)-dimethyl 2-(4-(((2,4-diaminopteridin-6-yl)methyl)(methyl)amino)benzamido)pentanedioate (S)-dimethyl 2-(4-(((2,4-diaminopteridin-6-yl)methyl)(methyl)amino)benzamido)pentanedioate 67676-60-2 C22H27ClN8O5
2-Pyrazinecarboxylic acid, 6-methyl-, 4-oxide 2-Pyrazinecarboxylic acid, 6-methyl-, 4-oxide 51037-31-1 C6H6N2O3
tert-butyl (3R,5R)-7-(1-((3R,5R)-7-(tert-butoxy)-3,5-dihydroxy-7-oxoheptyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrole-3-carboxamido)-3,5-dihydroxyheptanoate tert-butyl (3R,5R)-7-(1-((3R,5R)-7-(tert-butoxy)-3,5-dihydroxy-7-oxoheptyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrole-3-carboxamido)-3,5-dihydroxyheptanoate
NA NA
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2681355-40-6 C29H34Cl2N6O4S2
Isavuconazole Impurity 48 Isavuconazole Impurity 48
5,5'-((1R,1'R)-((5,6-diethyl-2,3-dihydro-1H-inden-2-yl)azanediyl)bis(1-hydroxyethane-2,1-diyl))bis(8-hydroxyquinolin-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-hydroxyquinolin-2(1H)-one)
(S)-2-(1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)-5-nitroisoindoline-1,3-dione (S)-2-(1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl)-5-nitroisoindoline-1,3-dione C20H20N2O8S
2-(4-(2-(4-(1-(2-methoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic acid 2-(4-(2-(4-(1-(2-methoxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic acid C27H35N3O3
Tafluprost Impurity 19 Tafluprost Impurity 19
Rosuvastatin Impurity 162 Rosuvastatin Impurity 162
Rosuvastatin Impurity 151 Rosuvastatin Impurity 151
Rosuvastatin Impurity 148 Rosuvastatin Impurity 148
FUROSEMIDE ACYL-B-D-GLUCURONIDE FUROSEMIDE ACYL-B-D-GLUCURONIDE 72967-59-0 C18H19ClN2O11S
Digoxin Impurity 1 Digoxin Impurity 1
Bimatoprost Impurity 23 Bimatoprost Impurity 23
Oxacillin Impurity IMPA Oxacillin Impurity IMPA
Rebamipide Impurity X(Rebamipide Impurity 7) Rebamipide Impurity X(Rebamipide Impurity 7)
(1S,2S,3R,5S)-3-(7-(((1R,2S)-2-(3-fluorophenyl)cyclopropyl)amino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol (1S,2S,3R,5S)-3-(7-(((1R,2S)-2-(3-fluorophenyl)cyclopropyl)amino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol
sodium 1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethane-1-sulfonate sodium 1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethane-1-sulfonate
Pyrimidine, 4,6-dichloro-5-nitroso-2-(propylthio)- Pyrimidine, 4,6-dichloro-5-nitroso-2-(propylthio)- 2512210-19-2 C7H7Cl2N3OS
5-Pyrimidinamine, 4,6-dichloro-N-hydroxy-2-(propylthio)- 5-Pyrimidinamine, 4,6-dichloro-N-hydroxy-2-(propylthio)- 2517939-84-1 C7H9Cl2N3OS
(R)-4-(4-methyl-6-oxo-1,4,5,6-tetrahydropyridazin-3-yl)benzenediazonium tetrafluoroborate (R)-4-(4-methyl-6-oxo-1,4,5,6-tetrahydropyridazin-3-yl)benzenediazonium tetrafluoroborate 1630761-21-5 C11H11N4O+
8-chloro-11-(1-((5-methylpyridin-3-yl)methyl)piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine 1-oxide 8-chloro-11-(1-((5-methylpyridin-3-yl)methyl)piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine 1-oxide
N-acetyl-β-D-glucosidase N-acetyl-β-D-glucosidase
2-(4-carboxypiperidin-1-yl)-3-chloro-5-((4-(4-chlorothiophen-2-yl)-5-(4-cyclohexylpiperazin-1-yl)thiazol-2-yl)carbamoyl)pyridine 1-oxide 2-(4-carboxypiperidin-1-yl)-3-chloro-5-((4-(4-chlorothiophen-2-yl)-5-(4-cyclohexylpiperazin-1-yl)thiazol-2-yl)carbamoyl)pyridine 1-oxide
CetearylGlucoside CetearylGlucoside 246159-33-1
Bisoprolol Impurity 40 Bisoprolol Impurity 40
2H-Naphtho[1,2-b]pyran-6-ol, 2,5-dimethyl-2-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]- (9CI) 2H-Naphtho[1,2-b]pyran-6-ol, 2,5-dimethyl-2-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]- (9CI) 65941-19-7 C31H40O2
Amifostine Impurity 15 Amifostine Impurity 15 10297-31-1 C7H17Br3N2
Doxylamine Impurity G Doxylamine Impurity G
2,4-Pyrimidinediol, 6-chloro- (9CI) 2,4-Pyrimidinediol, 6-chloro- (9CI) 107577-09-3 C4H3ClN2O2
Phenoxymethylpenicillin Potassium Impurity 8 Phenoxymethylpenicillin Potassium Impurity 8
Tegoprazan Impurity 4 Tegoprazan Impurity 4
Lexithromycin Lexithromycin 53066-26-5 C38H70N2O13
methylprednisolone 17-hemisuccinate methylprednisolone 17-hemisuccinate 77074-42-1 C26H34O8
8-hydroxymethylriboflavin 8-hydroxymethylriboflavin 52134-62-0 C17H20N4O7
RS 42358-197 RS 42358-197 135729-55-4 C19H23ClN2O
acetylthiamine acetylthiamine 3419-28-1
deacetylcephalosporin C deacetylcephalosporin C 1476-46-6 C14H19N3O7S
ETHYLVANILLINBETA-D-GLUCOPYRANOSIDE ETHYLVANILLINBETA-D-GLUCOPYRANOSIDE 122397-96-0 C15H20O8
4-(2-Cyanophenyl)benzyl alcohol 4-(2-Cyanophenyl)benzyl alcohol 154709-19-0 C14H11NO
1-Propanol, 3-[[2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-3-methyl-4-pyridinyl]oxy]- 1-Propanol, 3-[[2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-3-methyl-4-pyridinyl]oxy]- 117976-94-0 C17H19N3O3S
2',3'-O-isopropylidene cytidine 2',3'-O-isopropylidene cytidine 362-42-5 C12H17N3O5
4,4''-Dimethoxyazoxybenzene 4,4''-Dimethoxyazoxybenzene 501-58-6 C14H14N2O2
3,5-Dibenzyloxy terbutalline 3,5-Dibenzyloxy terbutalline 28924-25-6 C26H31NO3
1H-BENZIMIDAZOLE,2-CHLORO-1-(2-ETHOXYETHYL) 1H-BENZIMIDAZOLE,2-CHLORO-1-(2-ETHOXYETHYL) 87233-54-3 C11H13ClN2O
2,2-Dimethyl-4-isopropyl-1,3-benzodioxole (Propofol Impurity L) 2,2-Dimethyl-4-isopropyl-1,3-benzodioxole (Propofol Impurity L) 201166-22-5 C12H16O2
24Dichloro-5methoxyacetanilide 24Dichloro-5methoxyacetanilide 65182-98-1 C9H9Cl2NO2
Bumetanide Impurity 23 Bumetanide Impurity 23
Rocuronium Bromide Impurity 34、35、36 Rocuronium Bromide Impurity 34、35、36
Vinpocetine impurity C Vinpocetine impurity C 70155-05-4 C23H28N2O3
Cloxacillin Impurity X Cloxacillin Impurity X
1-(4-((2-(4-hydroxypiperidin-1-yl)ethyl)(methyl)carbamoyl)benzyl)piperidine-4-carboxamide 1-(4-((2-(4-hydroxypiperidin-1-yl)ethyl)(methyl)carbamoyl)benzyl)piperidine-4-carboxamide
Azilsartan Impurity 107 Azilsartan Impurity 107
Perospirone Impurity 25 Perospirone Impurity 25
Paxlovid Impurity 16 Paxlovid Impurity 16
3-(2-(cyclopent-1-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide 3-(2-(cyclopent-1-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide
Fondaparinux sodium impurity 17 Fondaparinux sodium impurity 17
Fondaparinux sodium impurity 12 Fondaparinux sodium impurity 12
Piperacillin impurity L Piperacillin impurity L
Piperacillin Impurity X Piperacillin Impurity X
ETHYLTRITYLETHER ETHYLTRITYLETHER 968-39-8 C21H20O
Bosutinib Impurity 41 Bosutinib Impurity 41
(S)-3-Dimethylamino-3-phenylpropanol (S)-3-Dimethylamino-3-phenylpropanol 82769-75-3 C11H17NO
Valdecoxib N-Oxide Valdecoxib N-Oxide
PIVALOYLOXYMETHYL 6-AMINOPENICILANATE PIVALOYLOXYMETHYL 6-AMINOPENICILANATE 25031-08-7 C14H22N2O5S
(9S)-9-Amino-9-deoxoerythromycin (9S)-9-Amino-9-deoxoerythromycin 26116-56-3 C37H70N2O12
NSC525120 NSC525120 10221-08-6 C8H7Cl3
3-(2-cyanoethyl-(2-hydroxyethyl)amino)propanenitrile 3-(2-cyanoethyl-(2-hydroxyethyl)amino)propanenitrile 6305-56-2 C8H13N3O
TRANS-4-[[(2-AMINOPHENYL)METHYL]AMINO]-CYCLOHEXANOL TRANS-4-[[(2-AMINOPHENYL)METHYL]AMINO]-CYCLOHEXANOL 46727-91-7 C13H20N2O
Citalopram Related Compound F Citalopram Related Compound F
(1R,3aS,4E,7aR)-4-[(2E)-2-[(3S,5R)-3,5-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methylenecyclohexylidene]ethylidene]octahydro-7a-methyl-1-[(1R,4S)-1,4,5-trimethylhexyl]-1H-Indene (1R,3aS,4E,7aR)-4-[(2E)-2-[(3S,5R)-3,5-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methylenecyclohexylidene]ethylidene]octahydro-7a-methyl-1-[(1R,4S)-1,4,5-trimethylhexyl]-1H-Indene 2229745-37-1 C40H74O2Si2
(+)-Tamsulosin (+)-Tamsulosin 106138-88-9 C20H28N2O5S
2-Pyrrolidinecarboxamide,1-(hydroxyacetyl)-,(S)-(9CI) 2-Pyrrolidinecarboxamide,1-(hydroxyacetyl)-,(S)-(9CI) 96166-39-1 C7H12N2O3
1H-Pyrazole,3-ethoxy-5-methyl-1-phenyl-(9CI) 1H-Pyrazole,3-ethoxy-5-methyl-1-phenyl-(9CI) 300543-31-1 C12H14N2O
(2-PHENOXY)METHYLSULFONYLANILINE (2-PHENOXY)METHYLSULFONYLANILINE 51765-51-6 C13H13NO3S
4-methoxy-2,3,5-trimethylpyridine 4-methoxy-2,3,5-trimethylpyridine 109371-19-9 C9H13NO
4,4,4-trifluoro-1-(2-methylphenyl)butane-1,3-dione 4,4,4-trifluoro-1-(2-methylphenyl)butane-1,3-dione 163266-02-2 C11H9F3O2
5-chloro-N-(4-nitrophenyl)pentanamide 5-chloro-N-(4-nitrophenyl)pentanamide 1039914-85-6 C11H13ClN2O3
N-(2,6-dimethylphenyl)piperidine-4-carboxamide N-(2,6-dimethylphenyl)piperidine-4-carboxamide 109403-19-2 C14H20N2O
5-{2-[1-(5-Hydroxy-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-4-ylidene]-ethylidene}-4-methylene-cyclohexane-1,3-diol 5-{2-[1-(5-Hydroxy-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-4-ylidene]-ethylidene}-4-methylene-cyclohexane-1,3-diol 73837-24-8 C27H44O3
6-(3-CHLOROPHENYL)-1,3,5-TRIAZINE-2,4-DIAMINE 6-(3-CHLOROPHENYL)-1,3,5-TRIAZINE-2,4-DIAMINE 4514-54-9 C9H8ClN5
α-Methyl-3,4-dihydroxy-L-phenylalanine methyl ester α-Methyl-3,4-dihydroxy-L-phenylalanine methyl ester 18181-08-3 C11H15NO4
(6R,7R)-3-Chloromethyl-7-methoxy-8-oxo-7-(p-toluoylamino)-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester (6R,7R)-3-Chloromethyl-7-methoxy-8-oxo-7-(p-toluoylamino)-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester 68314-38-5 C30H27ClN2O6
METHYL A-FORMYLPHENYLACETATE METHYL A-FORMYLPHENYLACETATE 5894-79-1 C10H10O3
1-Butanesulfonic acid methyl ester 1-Butanesulfonic acid methyl ester 2374-69-8 C5H12O3S
D-(-)-3-Acetylthio-2-methylpropionic acid D-(-)-3-Acetylthio-2-methylpropionic acid 76497-39-7 C6H10O3S
OLANEXIDINE OLANEXIDINE 146510-36-3 C17H27Cl2N5
1-(2-ETHOXY-ETHYL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 1-(2-ETHOXY-ETHYL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 101953-61-1 C11H14N2O2
3-Cyano-4-(2-methylpropoxy)benzenecarbothioamide 3-Cyano-4-(2-methylpropoxy)benzenecarbothioamide 163597-57-7 C12H14N2OS
1-BOC-4-(2-AMINO-4-PYRIDINYL)-PIPERAZINE 1-BOC-4-(2-AMINO-4-PYRIDINYL)-PIPERAZINE 571189-23-6 C14H22N4O2
1,3,5,7-Tetranitroadamantane 1,3,5,7-Tetranitroadamantane 75476-36-7 C10H12N4O8
Fexofenadinone Fexofenadinone 76811-98-8 C32H37NO4
2’-Deschloro-2’-hydroxy Dasatinib 2’-Deschloro-2’-hydroxy Dasatinib 1159977-25-9 C22H27N7O3S
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