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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
2-P-TOLYLOXYMETHYL-OXIRANE 2-P-TOLYLOXYMETHYL-OXIRANE 2186-24-5 C10H12O2
3-Hydroxyazobenzene 3-Hydroxyazobenzene 2437-11-8
Astragalin 7-O-β-D-glucopyranoside Astragalin 7-O-β-D-glucopyranoside 25615-14-9 C27H30O16
4-(5-CHLORO-2-THIENYL)-1,3-THIAZOL-2-AMINE 4-(5-CHLORO-2-THIENYL)-1,3-THIAZOL-2-AMINE 123971-45-9 C7H5ClN2S2
α,α-Dibromo-o-tolunitrile α,α-Dibromo-o-tolunitrile 655-63-0 C8H5Br2N
7-CHLORO-1-ETHYL-6-FLUORO-4-OXO-1,4-DIHYDRO-[1,8]NAPHTHYRIDINE-3-CARBOXYLIC ACID 7-CHLORO-1-ETHYL-6-FLUORO-4-OXO-1,4-DIHYDRO-[1,8]NAPHTHYRIDINE-3-CARBOXYLIC ACID 79286-73-0 C11H8ClFN2O3
HYDRIDE-L HYDRIDE-L 41639-74-1 C18H22O4
2-Amino-4-trifluoromethoxybenzothiazole 2-Amino-4-trifluoromethoxybenzothiazole 235101-36-7 C8H5F3N2OS
7-[(4S)-4-Amino-6-azaspiro[2.4]heptan-6-yl]-8-chloro-6-fluoro-1-[(1R,2S)-2-fluorocyclopropyl]-4-oxoquinoline-3-carboxylic acid 7-[(4S)-4-Amino-6-azaspiro[2.4]heptan-6-yl]-8-chloro-6-fluoro-1-[(1R,2S)-2-fluorocyclopropyl]-4-oxoquinoline-3-carboxylic acid 127254-10-8 C19H18ClF2N3O3
Sitagliptin Carbamoyl -D-Glucuronide Sitagliptin Carbamoyl -D-Glucuronide 940002-59-5 C23H23F6N5O9
5-Hydroxy Desloratadine 5-Hydroxy Desloratadine 117811-12-8 C19H19ClN2O
4-PyridinecarboxaMide, N-(2,6-diMethylphenyl)- 4-PyridinecarboxaMide, N-(2,6-diMethylphenyl)- 68280-05-7 C14H14N2O
4-N-Desacetyl-5-N-acetyl OseltaMivir 4-N-Desacetyl-5-N-acetyl OseltaMivir 956267-10-0 C16H28N2O4
rac N-DesMethyl-N-(4-Methoxyphenethyl) Venlafaxine rac N-DesMethyl-N-(4-Methoxyphenethyl) Venlafaxine 1346601-14-6 C25H35NO3
11-Keto Oxcarbazepine 11-Keto Oxcarbazepine 537693-29-1 C15H10N2O3
Isopropyl 4-(3-AMinophenyl)-1,4-dihydro-5-(2-Methoxyethoxycarbonyl)-2,6-diMethylpyridine-3-carboxylate Isopropyl 4-(3-AMinophenyl)-1,4-dihydro-5-(2-Methoxyethoxycarbonyl)-2,6-diMethylpyridine-3-carboxylate 155861-24-8 C21H28N2O5
N1-Losartanyl-losartan (Losartan IMpurity) N1-Losartanyl-losartan (Losartan IMpurity) 230971-71-8 C44H44Cl2N12O
N2-Losartanyl-losartan (Losartan IMpurity) N2-Losartanyl-losartan (Losartan IMpurity) 230971-72-9 C44H44Cl2N12O
O-Benzyl Posaconazole O-Benzyl Posaconazole 170985-86-1 C44H48F2N8O4
10-trans-Atorvastatin Acetonide tert-Butyl Ester 10-trans-Atorvastatin Acetonide tert-Butyl Ester 1105067-90-0 C40H47FN2O5
3-Bromo Carbidopa 3-Bromo Carbidopa 1246819-09-9 C10H13BrN2O4
(4S,6R)-6-(Cyanomethyl)-2,2-dimethyl-1,3-dioxane-4-acetic Acid tert-Butyl Ester (4S,6R)-6-(Cyanomethyl)-2,2-dimethyl-1,3-dioxane-4-acetic Acid tert-Butyl Ester 186508-95-2 C14H23NO4
(5R)-6-Cyano-5-hydroxy-3-oxo-hexanoic Acid tert-Butyl Ester (5R)-6-Cyano-5-hydroxy-3-oxo-hexanoic Acid tert-Butyl Ester 125988-01-4 C11H17NO4
(4-Carboxy-3-ethoxy)phenyl Acetic Acid (Repaglinide Impurity) (4-Carboxy-3-ethoxy)phenyl Acetic Acid (Repaglinide Impurity) 220438-80-2 C11H12O5
2-Chloromethyl-3,5-dimethylpyridin-4-ol 2-Chloromethyl-3,5-dimethylpyridin-4-ol 220771-03-9 C8H10ClNO
(3S,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester (3S,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester 186508-94-1 C11H19NO4
2-Methyl-6-[(4-methylphenyl)sulfonyl]-1,4,5,6-tetrahydroimidazo[4,5-d][1]benzazepine 2-Methyl-6-[(4-methylphenyl)sulfonyl]-1,4,5,6-tetrahydroimidazo[4,5-d][1]benzazepine 717917-14-1 C19H19N3O2S
(1R-4S)-4-[[(1,1-dimethylethoxy)carbonyl]amino]- 2-Cyclopentene-1-carboxylic acid methyl ester (1R-4S)-4-[[(1,1-dimethylethoxy)carbonyl]amino]- 2-Cyclopentene-1-carboxylic acid methyl ester 251326-99-5 C12H19NO4
O-Isobutyryl (R)-Fesoterodine O-Isobutyryl (R)-Fesoterodine 1208313-13-6 C30H43NO4
Isopropyl Itraconazole Isopropyl Itraconazole 89848-49-7 C34H36Cl2N8O4
(R)-(-)-Ibuprofen-d3 (R)-(-)-Ibuprofen-d3 121702-86-1 C13H18O2
(S,R,S,S)-Orlistat (S,R,S,S)-Orlistat 111466-63-8 C29H53NO5
N-Trityl Candesartan Ethyl Ester N-Trityl Candesartan Ethyl Ester 856414-35-2 C45H38N6O3
3R,4S-4-(4-methoxyphenyl)-1-methylpiperi dinyl] methanol 3R,4S-4-(4-methoxyphenyl)-1-methylpiperi dinyl] methanol 127017-78-1 C14H21NO2
6H-Purin-6-one, 2-amino-1,9-dihydro-9-[(1R,3S,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]- 6H-Purin-6-one, 2-amino-1,9-dihydro-9-[(1R,3S,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl]- 188399-46-4 C12H15N5O3
4,4'-(2-HYDROXY-1,3-PROPANDIYLDIOXY)BIS(2-PHENYLACETAMIDE) 4,4'-(2-HYDROXY-1,3-PROPANDIYLDIOXY)BIS(2-PHENYLACETAMIDE) 141650-31-9 C19H22N2O5
Valsartan cyano analog methyl ester Valsartan cyano analog methyl ester 137863-90-2 C25H30N2O3
(8S)-2-BroMo α-Ergocryptine (8S)-2-BroMo α-Ergocryptine 65700-36-9 C32H40BrN5O5
3-[4-(4-Chlorobenzoyl)phenoxy]-2-butanone (Fenofibrate IMpurity) 3-[4-(4-Chlorobenzoyl)phenoxy]-2-butanone (Fenofibrate IMpurity) 217636-47-0 C17H15ClO3
5-(2-Chlorobenzyl)-thieno[3,2-c]pyridiniuM Chloride 5-(2-Chlorobenzyl)-thieno[3,2-c]pyridiniuM Chloride 53885-64-6 C14H11Cl2NS
ClarithroMycin 9-OxiMe ClarithroMycin 9-OxiMe 103450-87-9 C38H70N2O13
Desloratadine N-Hydroxypiperidine Desloratadine N-Hydroxypiperidine 1193725-73-3 C19H19ClN2O
O-DesMethyl Venlafaxine Cyclic IMpurity O-DesMethyl Venlafaxine Cyclic IMpurity 1346601-55-5 C16H23NO2
rac-cis-2,3-Dichloro Sertraline Hydrochloride rac-cis-2,3-Dichloro Sertraline Hydrochloride 1198084-29-5 C17H18Cl3N
11β-Hydroperoxy Dienogest 11β-Hydroperoxy Dienogest 106111-43-7 C20H25NO4
2'-Nor ThiaMine 2'-Nor ThiaMine 7770-93-6 C11H15ClN4OS
N-Ethoxycarbonyl 7-ADCA N-Ethoxycarbonyl 7-ADCA 72820-16-7 C11H14N2O5S
(E)-Olopatadine (E)-Olopatadine 113806-06-7 C21H23NO3
NeMadipine B NeMadipine B 79925-38-5 C19H21Cl2NO4
N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole 957470-59-6 C24H24F2N4O6S
4-Epi-6-epi Doxycycline 4-Epi-6-epi Doxycycline 97583-08-9 C22H24N2O8
Ethyl 3,4-O-Isopropylidene-5-O-methanesulfonylshikimate Ethyl 3,4-O-Isopropylidene-5-O-methanesulfonylshikimate 204254-84-2 C13H20O7S
2-PyrazinecarboxaMide, N,N',N''-[2,4,6-boroxintriyltris[[(1R)-3-Methylbutylidene]iMino[(1S)-2-oxo-1-(phenylMethyl)-2,1-ethanediyl]]]tris- 2-PyrazinecarboxaMide, N,N',N''-[2,4,6-boroxintriyltris[[(1R)-3-Methylbutylidene]iMino[(1S)-2-oxo-1-(phenylMethyl)-2,1-ethanediyl]]]tris- 390800-88-1 C57H69B3N12O9
D-hydroxyphenylglycylamoxicillin) D-hydroxyphenylglycylamoxicillin) 188112-75-6 C24H26N4O7S
2-Benzylidene isobutyryl acetanilide 2-Benzylidene isobutyryl acetanilide 125971-57-5 C19H19NO2
ISOPROPYLAMINE HYDROCHLORIDE ISOPROPYLAMINE HYDROCHLORIDE 15572-56-2 C3H10ClN
Bimatoprost Impurity 17 Bimatoprost Impurity 17
Bumetanide Impurity 10 Bumetanide Impurity 10
Cefoxitin EP Impurity E (R-methoxy cefoxitin) Cefoxitin EP Impurity E (R-methoxy cefoxitin)
4(1H)-Pyrimidinone, 5-amino-6-chloro-2-(propylthio)- 4(1H)-Pyrimidinone, 5-amino-6-chloro-2-(propylthio)- 2512210-21-6 C7H10ClN3OS
Carbamic acid, N-[(1S)-1-methyl-2-oxo-2-[3-(phenylmethoxy)phenyl]ethyl]-, phenylmethyl ester Carbamic acid, N-[(1S)-1-methyl-2-oxo-2-[3-(phenylmethoxy)phenyl]ethyl]-, phenylmethyl ester 2151127-61-4 C24H23NO4
1-(chloromethyl)-4-(dichloromethyl)benzene 1-(chloromethyl)-4-(dichloromethyl)benzene 7398-44-9 C8H7Cl3
4,4'-(propane-1,3-diyl)bismorpholine 4,4'-(propane-1,3-diyl)bismorpholine 48152-09-6 C11H22N2O2
Acetamide, N-(4-hydroxyphenyl)-N-nitroso- Acetamide, N-(4-hydroxyphenyl)-N-nitroso- 146897-60-1 C8H8N2O3
3-Azetidineacetonitrile, 1-(ethylsulfonyl)-3-[4-(1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl]- 3-Azetidineacetonitrile, 1-(ethylsulfonyl)-3-[4-(1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl]- 2402776-83-2 C16H17N7O2S
Iohexol ImpuritiesE Iohexol ImpuritiesE
TERT-BUTYL (R)-6-CHLORO-5-HYDROXY-3-OXOHEXANOATE TERT-BUTYL (R)-6-CHLORO-5-HYDROXY-3-OXOHEXANOATE 404958-08-3 C10H17ClO4
2-(3-(4-(4-(1-(3-(cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-1H-pyrazol-1-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile 2-(3-(4-(4-(1-(3-(cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-1H-pyrazol-1-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile
Roxadustat Impurity 17 Roxadustat Impurity 17
Perospirone Impurity 20 Perospirone Impurity 20 1002359-81-0
Dolutegravir Impurity 19 Dolutegravir Impurity 19
Cephalexin Impurity I Cephalexin Impurity I
Fondaparinux sodium impurity 6 Fondaparinux sodium impurity 6
Fondaparinux sodium impurity 2 Fondaparinux sodium impurity 2
Oxacillin sodium Impurity I Oxacillin sodium Impurity I
Mixture of Cefoxitin Impurity E&F Mixture of Cefoxitin Impurity E&F
Revefenacin Impurity 22 Revefenacin Impurity 22
Lasmiditan Impurity 7 Lasmiditan Impurity 7
Febuxostat impurity BAC Febuxostat impurity BAC
4-(3,4-DICHLOROPHENYL)-1,2,3,4-TETRAHYDRO-1-NAPHTHALENOL 4-(3,4-DICHLOROPHENYL)-1,2,3,4-TETRAHYDRO-1-NAPHTHALENOL 866018-46-4 C16H14Cl2O
Lasmiditan Impurity 9 Lasmiditan Impurity 9
Letermovir Impurity 2 Letermovir Impurity 2
1H-Imidazole-2-carboxylic acid 1H-Imidazole-2-carboxylic acid 16042-25-4 C4H4N2O2
Olodaterol Impurity 19 Olodaterol Impurity 19
Ethacridine Impurity 12 Ethacridine Impurity 12
2-[4-[(2RS)-2-HYDROXY-3[(1-METHYLETHYL)AMINO]PROPOXY]PHENYL]ACETONITRILE 2-[4-[(2RS)-2-HYDROXY-3[(1-METHYLETHYL)AMINO]PROPOXY]PHENYL]ACETONITRILE 29277-73-4 C14H20N2O2
(-)-Nebivolol (-)-Nebivolol 118457-16-2 C22H25F2NO4
2-Hydroxymethyl Olanzapine 2-Hydroxymethyl Olanzapine 174756-45-7 C17H20N4OS
5-Hydroxymethyl Flucloxacillin 5-Hydroxymethyl Flucloxacillin 75524-31-1 C19H17ClFN3O6S
6-Hydroxy-5-methoxy-1-indanone 6-Hydroxy-5-methoxy-1-indanone 90843-62-2 C10H10O3
9-cis Acitretin 9-cis Acitretin 419534-31-9 C21H26O3
N-Desmethylvinblastine N-Desmethylvinblastine 18172-50-4 C45H56N4O9
Rabeprazole Sulfone Rabeprazole Sulfone 117976-47-3 C18H21N3O4S
6-BROMO-3 H-ISOBENZOFURAN-1-ONE 6-BROMO-3 H-ISOBENZOFURAN-1-ONE 19477-73-7 C8H5BrO2
TOPOTECANACETATE TOPOTECANACETATE 123948-88-9 C25H27N3O7
dimethyl 2,6-dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3,5-dicarb oxylate dimethyl 2,6-dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3,5-dicarb oxylate 21829-09-4 C17H18N2O6
Metronidazole IMpurity (1-Methyl-4-Nitro-1H-IMidazole) Metronidazole IMpurity (1-Methyl-4-Nitro-1H-IMidazole) 143508-97-8 C2H3NO
benidipine benidipine 119009-45-9 C28H31N3O6
(S)-Phenylephrine hydrochloride (S)-Phenylephrine hydrochloride 939-38-8 C9H14ClNO2
6α-Methyl Hydrocortisone 21-Acetate 6α-Methyl Hydrocortisone 21-Acetate 1625-11-2 C24H34O6
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