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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Roxithromycin EP Impurity D Roxithromycin EP Impurity D 134931-00-3 C41H76N2O15
2-(pentan-3-yloxy)acetaldehyde 2-(pentan-3-yloxy)acetaldehyde 1141364-90-0 C7H14O2
Abiraterone Impurity 10 Abiraterone Impurity 10 165334-69-0 C26H33NO2
Cabozantinib Impurity B Cabozantinib Impurity B
(R)-5-(2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidin-3-amine (R)-5-(2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidin-3-amine 1223404-88-3 C16H15F2N5
Pinocembrin 7-O-beta-D-glucoside Pinocembrin 7-O-beta-D-glucoside 75829-43-5 C21H22O9
Ceftazidime Ep Impurity H Ceftazidime Ep Impurity H 1354396-23-8 C23H24N6O7S2
Parecoxib Sodium Impurity 14 Parecoxib Sodium Impurity 14 1709956-89-7 C19H18N2O4S
Benzoic acid, 2-[(methylamino)sulfonyl]- Benzoic acid, 2-[(methylamino)sulfonyl]- 125372-22-7 C8H9NO4S
1-Piperazineethanol,4-[(2-chlorophenyl)(3-chlorophenyl)methyl]-, hydrochloride (1:2) 1-Piperazineethanol,4-[(2-chlorophenyl)(3-chlorophenyl)methyl]-, hydrochloride (1:2) 126517-38-2 C19H24Cl4N2O
Benzene,1-ethoxy-4-(phenylmethyl)- Benzene,1-ethoxy-4-(phenylmethyl)- 35672-52-7 C15H16O
Donepezil Impurity Donepezil Impurity 36159-03-2 C22H22O5
tert-Butyl 4-(4-nitropyridin-3-yl)piperazine-1-carboxylate tert-Butyl 4-(4-nitropyridin-3-yl)piperazine-1-carboxylate 1774898-55-3 C14H20N4O4
4-(2-Aminophenoxy)-N-methylpicolinamide 4-(2-Aminophenoxy)-N-methylpicolinamide 1153328-25-6 C13H13N3O2
3-(5-Methyl-3-phenylisoxazol-4-yl)benzenesulfonaMide 3-(5-Methyl-3-phenylisoxazol-4-yl)benzenesulfonaMide C16H14N2O3S
Tigecycline Tigecycline
1-((2R,3R,4R,5R)-3-chloro-4-hydroxy-5-(hydroxyMethyl)-3-Methyltetrahydrofuran-2-yl)pyriMidine-2,4(1H,3H)-dione 1-((2R,3R,4R,5R)-3-chloro-4-hydroxy-5-(hydroxyMethyl)-3-Methyltetrahydrofuran-2-yl)pyriMidine-2,4(1H,3H)-dione 1496551-72-4 C10H13ClN2O5
1-NaphthaleneMethanaMine, 7,8-dihydro-α-Methyl-N-[3-[3-(trifluoroMethyl)phenyl]propyl]-, hydrochloride (1:1), (αR)- 1-NaphthaleneMethanaMine, 7,8-dihydro-α-Methyl-N-[3-[3-(trifluoroMethyl)phenyl]propyl]-, hydrochloride (1:1), (αR)- 1020414-33-8 C22H25ClF3N
4,6-dichloro-2-(propylsulfinyl)pyriMidin-5-aMine 4,6-dichloro-2-(propylsulfinyl)pyriMidin-5-aMine 1823431-32-8 C7H9Cl2N3OS
Acetic acid, [[(3aR,4S,6R,6aS)-tetrahydro-2,2-diMethyl-6-[[(phenylMethoxy)carbonyl]aMino]-4H-cyclopenta-1,3-dioxol-4-yl]oxy]-, ethyl ester Acetic acid, [[(3aR,4S,6R,6aS)-tetrahydro-2,2-diMethyl-6-[[(phenylMethoxy)carbonyl]aMino]-4H-cyclopenta-1,3-dioxol-4-yl]oxy]-, ethyl ester 866551-95-3 C20H27NO7
4',6'-Dinitro-2'-phenoxymethanesulfonanilide 4',6'-Dinitro-2'-phenoxymethanesulfonanilide 51765-56-1 C13H11N3O7S
5-[1-Hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]salicylic acid methyl ester hydrochloride 5-[1-Hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]salicylic acid methyl ester hydrochloride 33778-93-7 C20H26ClNO4
Blonanserin Impurity I Blonanserin Impurity I
25,26,26,26,27,27-hexadeuterocholest-5-ene-3,27-diol 25,26,26,26,27,27-hexadeuterocholest-5-ene-3,27-diol 1246302-95-3 C27H40D6O2
2-Azabicyclo[3.1.0]hexane-3-carbonitrile, 2-[(2R)-2-aMino-2-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)acetyl]-, (1R,3R,5R)- 2-Azabicyclo[3.1.0]hexane-3-carbonitrile, 2-[(2R)-2-aMino-2-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)acetyl]-, (1R,3R,5R)- 1564265-95-7 C18H25N3O2
(1S,5R,6R)-5-Hydroxy-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Ethyl Ester (1S,5R,6R)-5-Hydroxy-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Ethyl Ester 876014-27-6 C9H12O4
(3R,5R)-Rosuvastatin Lactone (3R,5R)-Rosuvastatin Lactone 1422954-11-7 C22H26FN3O5S
(S)-4,5,6,7-Tetrahydro-2,6-benzothiazolediamine (S)-4,5,6,7-Tetrahydro-2,6-benzothiazolediamine 1867177-06-7 C9H13N3OS
EMpagliflozin iMpurity 10 EMpagliflozin iMpurity 10 2069942-68-1 C32H37ClO12
EMpagliflozin iMpurity 15 EMpagliflozin iMpurity 15
(S)-8-(3-aMinopiperidin-1-yl)-7-(but-2-ynyl)-3-Methyl-1-((4-Methylquinazolin-2-yl)Methyl)-1H-purine-2,6(3H,7H)-dione (S)-8-(3-aMinopiperidin-1-yl)-7-(but-2-ynyl)-3-Methyl-1-((4-Methylquinazolin-2-yl)Methyl)-1H-purine-2,6(3H,7H)-dione 668269-51-0 C25H28N8O2
ibrutinib iMpurity B ibrutinib iMpurity B
Sunitinib iMpurity A Sunitinib iMpurity A
Sunitinib iMpurity F Sunitinib iMpurity F
(3R,4S)-1-(3-fluorophenyl)-3-((S)-3-(4-fluorophenyl)-3-hydroxypropyl)-4-(4-hydroxyphenyl)azetidin-2-one (3R,4S)-1-(3-fluorophenyl)-3-((S)-3-(4-fluorophenyl)-3-hydroxypropyl)-4-(4-hydroxyphenyl)azetidin-2-one 1700622-06-5 C24H21F2NO3
Betamethasone EP Impurity J Betamethasone EP Impurity J 18383-24-9 C22H30O4
Cefazedone Related Impurity 10 Cefazedone Related Impurity 10 18884-65-6 C10H12N2O5S
Etoricoxib Impurity 8 Etoricoxib Impurity 8 1421227-97-5 C22H20N2O4S
Mupirocin Impurity E Mupirocin Impurity E C26H44O9
Phenylephrine Impurity 1 Phenylephrine Impurity 1 C9H13NO2
Rupatadine Impurity B Rupatadine Impurity B 156523-04-5 C26H24ClN3O
Theophylline Impurity 1 Theophylline Impurity 1 5614-53-9 C9H10N4O3
Venlafaxine N-Dimer Venlafaxine N-Dimer 1187545-61-4 C32H48N2O4
ent-Ivabradine Hydrochloride ent-Ivabradine Hydrochloride 148849-68-7 C27H37ClN2O5
Sofosbuvir metabolites GS566500 Sofosbuvir metabolites GS566500 1233335-78-8 C13H19FN3O9P
Ondansetron impurity G (PhEur) Ondansetron impurity G (PhEur) 99614-04-7 C17H18ClN3O
4-Hydroxy-1-methyl-7-phenoxy-3-isoquinolinecarboxylic acid methyl ester 4-Hydroxy-1-methyl-7-phenoxy-3-isoquinolinecarboxylic acid methyl ester 1421312-34-6 C18H15NO4
2-[(4-METHYLPHENOXY)METHYL]BENZOIC ACID 2-[(4-METHYLPHENOXY)METHYL]BENZOIC ACID 728-97-2 C15H14O3
Ethyl (1R,2R,3S,4R,5S)-4-acetamido-5-amino-2-azido-3- (1-ethylpropoxy)cyclohexanecarboxylate Ethyl (1R,2R,3S,4R,5S)-4-acetamido-5-amino-2-azido-3- (1-ethylpropoxy)cyclohexanecarboxylate 2124269-41-4 C16H29N5O4
2-AMINO-3,5-DIBROMOBENZENE-1-CARBOHYDRAZIDE 2-AMINO-3,5-DIBROMOBENZENE-1-CARBOHYDRAZIDE 97096-13-4 C7H7Br2N3O
Trityl losartan Trityl losartan 133909-99-6 C41H37ClN6O
4-BROMOMETHYLBIPHEBYL-2'-CARBOXYLIC ACID 4-BROMOMETHYLBIPHEBYL-2'-CARBOXYLIC ACID 150766-86-2 C14H11BrO2
Letrozole Impurity Letrozole Impurity
Alogliptin Impurity C Alogliptin Impurity C 1108731-49-2 C20H23N5O3
O-Desethyl Azilsartan O-Desethyl Azilsartan 1442400-68-1 C23H16N4O5
17- Phenyl Trinor Prostaglandin F2α Methyl Amide 17- Phenyl Trinor Prostaglandin F2α Methyl Amide 155206-01-2 C24H35NO4
1-(((2R,4R)-4-((Benzyloxy)methyl)-2-(2,4-difluorophenyl)tetrahydrofuran-2-yl)methyl)-1H-1,2,4-triazole 1-(((2R,4R)-4-((Benzyloxy)methyl)-2-(2,4-difluorophenyl)tetrahydrofuran-2-yl)methyl)-1H-1,2,4-triazole 165115-83-3 C21H21F2N3O2
1-Cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-[(4aR,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic Acid 1-Cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-7-[(4aR,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic Acid 855661-71-1 C21H24FN3O4
Iopamidol Impurity K Iopamidol Impurity K 1788899-70-6 C17H23I2N3O8
N-(2-(diethylamino)ethyl)-2-hydroxyquinoline-4-carboxamide N-(2-(diethylamino)ethyl)-2-hydroxyquinoline-4-carboxamide 87864-08-2 C16H21N3O2
5-(2-Fluorophenyl)-1-(3-pyridinylsulfonyl)-1H-pyrrole-3-carboxylic acid 5-(2-Fluorophenyl)-1-(3-pyridinylsulfonyl)-1H-pyrrole-3-carboxylic acid 1883595-37-6 C16H11FN2O4S
Ritonavir EP Impurity B Ritonavir EP Impurity B 765875-58-9 C28H36N4O4S
2-[4-(2,3-DIHYDROXYPROPOXY)PHENYL]ACETAMIDE 2-[4-(2,3-DIHYDROXYPROPOXY)PHENYL]ACETAMIDE 61698-76-8 C11H15NO4
3-OXO-3-(2,4,5-TRIFLUORO-3-METHOXY-PHENYL)-PROPIONIC ACID ETHYL ESTER 3-OXO-3-(2,4,5-TRIFLUORO-3-METHOXY-PHENYL)-PROPIONIC ACID ETHYL ESTER 112811-68-4 C12H11F3O4
2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-N5,N5- dimethylpyrimidine-4,5,6-triamine 2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-N5,N5- dimethylpyrimidine-4,5,6-triamine 1169770-52-8 C19H19FN8
Roxithromycin Impurity K Roxithromycin Impurity K
Bepotastine N-Oxide Impurity Bepotastine N-Oxide Impurity
Nintedanib Impurity 25 Nintedanib Impurity 25
(RS)-3-tert-butyl 4-ethyl thiazolidine-3,4-dicarboxylate (RS)-3-tert-butyl 4-ethyl thiazolidine-3,4-dicarboxylate C11H19NO4S
ZIDOVUDINE IMPURITY B ZIDOVUDINE IMPURITY B
Alogliptin Impurity C Alogliptin Impurity C 1108731-49-2 C20H23N5O3
Parecoxib Impurity J Parecoxib Impurity J
6-(4-(4-(benzo[b]thiophen-4-yl)piperazin-1-yl)butoxy)-1-(4-(2-oxo-1,2-dihydroquinolin-7-yloxy)butyl)quinolin-2(1H)-one 6-(4-(4-(benzo[b]thiophen-4-yl)piperazin-1-yl)butoxy)-1-(4-(2-oxo-1,2-dihydroquinolin-7-yloxy)butyl)quinolin-2(1H)-one C38H40N4O4S
Atracurium Impurity F Atracurium Impurity F
Linagliptin Impurity J Linagliptin Impurity J
Linagliptin Impurity Q Linagliptin Impurity Q
(R)-2-(((1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)amino)methyl)-4-fluorobenzonitrile (R)-2-(((1-(3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)piperidin-3-yl)amino)methyl)-4-fluorobenzonitrile C26H24F2N6O2
Rosuvastatin Calcium Impurity Rosuvastatin Calcium Impurity
Canagliflozin Monoacetyl Impurity Canagliflozin Monoacetyl Impurity
Etoricoxib Impurity 13 Etoricoxib Impurity 13 1817735-82-2 C25H20ClN3O3S
Mirabegron Impurity 11 Mirabegron Impurity 11 1684452-85-4 C21H24N4O2S
Riociguat Impurtiy 2 Riociguat Impurtiy 2
Topiroxostat Impurity 9 Topiroxostat Impurity 9 577778-82-6 C13H8N6O
Vonoprazan Impurity F Vonoprazan Impurity F
Vortioxetine Impurity 15 Vortioxetine Impurity 15 2099147-02-9 C28H34N4S2
Dapagliflozin Impurity H Dapagliflozin Impurity H
Dapoxetine Impurity C Dapoxetine Impurity C
Eltrombopag Impurity 4 Eltrombopag Impurity 4
Iodixanol Impurity Iodixanol Impurity
Levothyroxine EP Impurity B Levothyroxine EP Impurity B 1628720-66-0 C15H11ClI3NO4
Ribavirin Imp. EP) Ribavirin Imp. EP)
Sertraline EP Impurity Sertraline EP Impurity C17H17Cl2N
Vildagliptin Related Compound G Vildagliptin Related Compound G 1616662-84-0 C12H20N4O3
3-ethyl 5-isopropyl 2-((2-aminoethoxy)methyl)-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate 3-ethyl 5-isopropyl 2-((2-aminoethoxy)methyl)-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate 158151-92-9 C22H29ClN2O5
Methyl 3-acetamido-4-(2,4,5-trifluorophenyl)but-2-enoate Methyl 3-acetamido-4-(2,4,5-trifluorophenyl)but-2-enoate 1234321-81-3 C13H12F3NO3
FG-4592 intermediate 8 FG-4592 intermediate 8 1509958-20-6 C20H17NO6
Parecoxib Sodium Imp.E Parecoxib Sodium Imp.E
Trelagliptin Impurity 7 Trelagliptin Impurity 7
Ofloxacin/Levofloxacin Impurity B Ofloxacin/Levofloxacin Impurity B
Pramipexole impurity II Pramipexole impurity II
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