Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Cisatracurium besylate impurity 21 Cisatracurium besylate impurity 21
Dacomitinib Impurity Dacomitinib Impurity
6-O-DESMETHYL DONEPEZIL 6-O-DESMETHYL DONEPEZIL 120013-56-1 C23H27NO3
2-(2-METHYL-4-NITRO-IMIDAZOL-1-YL)-ETHANOL 2-(2-METHYL-4-NITRO-IMIDAZOL-1-YL)-ETHANOL 705-19-1 C6H9N3O3
2,6-DIMETHYL-4-(3-NITRO-PHENYL)-PYRIDINE-3,5-DICARBOXYLIC ACID DIMETHYL ESTER 2,6-DIMETHYL-4-(3-NITRO-PHENYL)-PYRIDINE-3,5-DICARBOXYLIC ACID DIMETHYL ESTER 76258-20-3 C17H16N2O6
3-(2-TRIFLUOROMETHYL-PHENYL)-PROPAN-1-OL 3-(2-TRIFLUOROMETHYL-PHENYL)-PROPAN-1-OL 191155-81-4 C10H11F3O
N,N-bis((5-(2-fluorophenyl)-1H-pyrrol-3-yl)methyl)pyridine-3-sulfonamide N,N-bis((5-(2-fluorophenyl)-1H-pyrrol-3-yl)methyl)pyridine-3-sulfonamide 2514957-29-8 C27H22F2N4O2S
2,4(1H,3H)-Pyrimidinedione, 1-β-L-ribofuranosyl-, 4-oxime (9CI) 2,4(1H,3H)-Pyrimidinedione, 1-β-L-ribofuranosyl-, 4-oxime (9CI) 402725-23-9 C9H13N3O6
1H-Indole-2-sulfonic acid, 6-hydroxy-1-methyl- 1H-Indole-2-sulfonic acid, 6-hydroxy-1-methyl- 2271443-87-7 C9H9NO4S
methyl 4-hydroxy-2-oxopyrrolidine-1-acetate methyl 4-hydroxy-2-oxopyrrolidine-1-acetate 85614-52-4 C7H11NO4
Sitagliptin EP Impurity 5 Sitagliptin EP Impurity 5
Simvastatin Impurity 6 Simvastatin Impurity 6
Anastrozole Impurity 14 Anastrozole Impurity 14
Pemetrexed Impurity 42 Pemetrexed Impurity 42
2-(6-Aminopurin-9-yl)ethanol 2-(6-Aminopurin-9-yl)ethanol 707-99-3 C7H9N5O
9-Azabicyclo[3.3.1]Nonane-9-Acetic Acid, 3-(Ethoxycarbonyl)-7-Oxo-, Ethyl Ester 9-Azabicyclo[3.3.1]Nonane-9-Acetic Acid, 3-(Ethoxycarbonyl)-7-Oxo-, Ethyl Ester 115956-03-1 C15H23NO5
Cefathiamidine Impurity F Cefathiamidine Impurity F
1-(Bromophenylmethyl)-4-chlorobenzene 1-(Bromophenylmethyl)-4-chlorobenzene 948-54-9 C13H10BrCl
Flomoxef oxidation impurities Flomoxef oxidation impurities
Toltrazuril Impurity 1 Toltrazuril Impurity 1
((2R,3R,5S)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-4,4-difluoro-3-hydroxytetrahydrofuran-2-yl)methyl benzoate ((2R,3R,5S)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-4,4-difluoro-3-hydroxytetrahydrofuran-2-yl)methyl benzoate
Aprepitant Impurity 53 Aprepitant Impurity 53
Cetrorelix Impurity 21 Cetrorelix Impurity 21
Brivaracetam Impurity 43 Brivaracetam Impurity 43
NA NA
Peramivir Intermediate Impurity 37 Peramivir Intermediate Impurity 37
Peramivir Diastereomer Impurity 1 Peramivir Diastereomer Impurity 1
NA NA
Canagliflozin Impurities 999 Canagliflozin Impurities 999
1,4,8,11-tetraazacyclotetradecane sodium chelation 1,4,8,11-tetraazacyclotetradecane sodium chelation
NA NA
4-Methoxy-2,3,5-trimethylpyride-N-oxide 4-Methoxy-2,3,5-trimethylpyride-N-oxide 86604-80-0 C9H13NO2
1-BOC-4-(5-NITRO-2-PYRIDYL)PIPERAZINE 1-BOC-4-(5-NITRO-2-PYRIDYL)PIPERAZINE 193902-78-2 C14H20N4O4
(1R,3r,5S)-8-methyl-8-azabicyclo[3.2.1]octan-3-yl 2-phenylacetate (1R,3r,5S)-8-methyl-8-azabicyclo[3.2.1]octan-3-yl 2-phenylacetate
Relugolix Impurity 25 Relugolix Impurity 25
Lumateperone Impurity 5 Lumateperone Impurity 5
Sugammadex Sodium Impurity ORG139131-1 Sugammadex Sodium Impurity ORG139131-1
2-[4-(Azidomethyl)phenyl]benzoic acid 2-[4-(Azidomethyl)phenyl]benzoic acid
2-[(2-AZIDOETHOXY)METHYL]-4-(2-CHLOROPHENYL)-3-ETHOXYCARBONYL-5-METHOXYCARBONYL)-6-METHYL-1,4-DIHYDROPYRIDINE 2-[(2-AZIDOETHOXY)METHYL]-4-(2-CHLOROPHENYL)-3-ETHOXYCARBONYL-5-METHOXYCARBONYL)-6-METHYL-1,4-DIHYDROPYRIDINE 88150-46-3 C20H23ClN4O5
((6aR,9R,10aR)-7-methyl-4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg]quinolin-9-yl)methanol acetic acid salt ((6aR,9R,10aR)-7-methyl-4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg]quinolin-9-yl)methanol acetic acid salt
Brivaracetam Impurity 56 Brivaracetam Impurity 56
Oxytocin Impurity 3 Oxytocin Impurity 3
Rosuvastatin Impurity 158 Rosuvastatin Impurity 158
Rosuvastatin Impurity 139 Rosuvastatin Impurity 139
Rosuvastatin Impurity 124 Rosuvastatin Impurity 124
Ethyl 5,6-dichloro-3,4-dihydro-2(1H)-iminoquinazoline-3-acetate hydrobromide Ethyl 5,6-dichloro-3,4-dihydro-2(1H)-iminoquinazoline-3-acetate hydrobromide 70381-75-8 C12H14BrCl2N3O2
4-(3,4-Dichlorophenyl)-1,2,3,4-Tetrahydro- 4-(3,4-Dichlorophenyl)-1,2,3,4-Tetrahydro- 79617-95-1 C17H17Cl2N
Avatrombopag Impurity 77 Avatrombopag Impurity 77
methyl 5-((4-(3-carbamoyl-1-(4-methoxyphenyl)-7-oxo-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)phenyl)amino)pentanoate methyl 5-((4-(3-carbamoyl-1-(4-methoxyphenyl)-7-oxo-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)phenyl)amino)pentanoate
N-(4-((3-chloro-4-fluorophenyl)amino)-7-fluoroquinazolin-6-yl)-4-(dimethylamino)butanamide N-(4-((3-chloro-4-fluorophenyl)amino)-7-fluoroquinazolin-6-yl)-4-(dimethylamino)butanamide
Ertapenem Impurity A(USP) Ertapenem Impurity A(USP)
D-Glutamic acid, 4-(cyanomethyl)-N-[(1,1-dimethylethoxy)carbonyl]-, 1,5-dimethyl ester, (4S)-rel- D-Glutamic acid, 4-(cyanomethyl)-N-[(1,1-dimethylethoxy)carbonyl]-, 1,5-dimethyl ester, (4S)-rel- 2740644-40-8 C14H22N2O6
2-hydroxy-3-oxobutyl 2-ethoxy-1-((2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)-[1,1'-biphenyl]-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylate 2-hydroxy-3-oxobutyl 2-ethoxy-1-((2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)-[1,1'-biphenyl]-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylate
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2731089-65-7 C27H34N2O6
(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
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
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
2-(2-ethoxy-3-((4-ethylpiperazin-1-yl)sulfonyl)phenyl)-5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(1H)-one 2-(2-ethoxy-3-((4-ethylpiperazin-1-yl)sulfonyl)phenyl)-5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(1H)-one
Bumetanide Photodegradable Impurity 15 Bumetanide Photodegradable Impurity 15
Bisoprolol Impurity 48 Bisoprolol Impurity 48
Cyclopentanecarboxylic acid, 3-[(1S)-1-(acetylamino)-2-ethylbutyl]-4-amino-2-hydroxy-, methyl ester, (1S,2S,3R,4R)-, mono(trifluoroacetate) (salt) (9CI) Cyclopentanecarboxylic acid, 3-[(1S)-1-(acetylamino)-2-ethylbutyl]-4-amino-2-hydroxy-, methyl ester, (1S,2S,3R,4R)-, mono(trifluoroacetate) (salt) (9CI) 357448-34-1 C17H29F3N2O6
Dobutamine Impurity 16 Dobutamine Impurity 16
Faropenem Impurity AB Faropenem Impurity AB
Nirmatrelvir Impurity 9 Nirmatrelvir Impurity 9
4-nitro-1H-Imidazole-2-carboxaldehyde 4-nitro-1H-Imidazole-2-carboxaldehyde 33543-81-6 C4H3N3O3
1-CHLOROMETHYL-2,3,4-TRIMETHOXYBENZENE 1-CHLOROMETHYL-2,3,4-TRIMETHOXYBENZENE 1133-49-9 C10H13ClO3
Bumetanide Impurity 19 Bumetanide Impurity 19
Rocuronium Bromide Impurity 26 、27 Rocuronium Bromide Impurity 26 、27
Roxadustat Impurity 20 Roxadustat Impurity 20
Ruxolitinib Impurity Ruxolitinib Impurity
	Sitagliptin Impurity 82 Sitagliptin Impurity 82
(1S,7S,8S,8aR)-8-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran- 2-yl)ethyl)-3,7-dimethyl-1,2,4a,5,6,7,8,8a-octahydronaphthalen-1-yl 2,2-dimethylbutanoate (1S,7S,8S,8aR)-8-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran- 2-yl)ethyl)-3,7-dimethyl-1,2,4a,5,6,7,8,8a-octahydronaphthalen-1-yl 2,2-dimethylbutanoate
Perospirone Impurity 21 Perospirone Impurity 21
Perospirone Impurity 11 Perospirone Impurity 11
Dolutegravir Impurity 21 Dolutegravir Impurity 21
NA NA
Fondaparinux sodium impurity 7 Fondaparinux sodium impurity 7
Fondaparinux sodium impurity 3 Fondaparinux sodium impurity 3
Oxacillin sodium  Impurity B Oxacillin sodium Impurity B
Revefenacin Impurity 21 Revefenacin Impurity 21
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