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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
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
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-(4-{2-[3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 6-(4-{2-[3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 140710-96-9 C39H72O3Si2
(+)-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
(Z)-4-HYDROXYTAMOXIFEN (Z)-4-HYDROXYTAMOXIFEN 65213-48-1 C26H29NO2
10-Methoxyiminostilbene-5-carbonylchloride 10-Methoxyiminostilbene-5-carbonylchloride 28721-08-6 C16H12ClNO2
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
rac Benzyl Phenylephrine rac Benzyl Phenylephrine 1159977-09-9 C16H19NO2
Atorvastatin Acetonide Atorvastatin Acetonide 581772-29-4 C36H39FN2O5
4H-Imidazo[1,5-a][1,4]benzodiazepine-3-carboxylicacid, 5,6-dihydro-8-hydroxy-5-methyl-6-oxo-, ethyl ester 4H-Imidazo[1,5-a][1,4]benzodiazepine-3-carboxylicacid, 5,6-dihydro-8-hydroxy-5-methyl-6-oxo-, ethyl ester 131666-45-0 C15H15N3O4
α,α-Bis[2-(dimethylamino)ethyl]- α,α-Bis[2-(dimethylamino)ethyl]- 1246816-57-8 C16H24ClN3
(3R,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester (3R,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester 125971-93-9 C11H19NO4
2-Desethoxy-2-hydroxy-2H-2-ethyl Candesartan Cilexetil 2-Desethoxy-2-hydroxy-2H-2-ethyl Candesartan Cilexetil 1185256-03-4 C33H34N6O6
N-Desethyl-N-propyl Oxybutynin N-Desethyl-N-propyl Oxybutynin 1215677-72-7 C23H33NO3
3-Oxo Atorvastatin 3-Oxo Atorvastatin 887196-30-7 C33H33FN2O5
Octyl Orlistat Octyl Orlistat 1243011-56-4 C31H57NO5
1,2,3,4-Tetrahydro-4,8-dihydroxy-2-methyl-isoquinoline 1,2,3,4-Tetrahydro-4,8-dihydroxy-2-methyl-isoquinoline 23824-25-1 C10H13NO2
(E)-Cefetamet Pivoxil (E)-Cefetamet Pivoxil 1705612-82-3 C20H25N5O7S2
{3-[2-(DiMethylaMino)ethyl]-5-[(pyrrolidine-1-yl)sulfonylMethyl]-1H-indol-1-yl}Methanol {3-[2-(DiMethylaMino)ethyl]-5-[(pyrrolidine-1-yl)sulfonylMethyl]-1H-indol-1-yl}Methanol 1018676-02-2 C18H27N3O3S
{3-[2-(DiMethylaMino)ethyl]-5-[(pyrrolidine-1-yl)sulfonylMethyl]-1H-indol-1-yl}Methanol {3-[2-(DiMethylaMino)ethyl]-5-[(pyrrolidine-1-yl)sulfonylMethyl]-1H-indol-1-yl}Methanol 1018676-02-2 C18H27N3O3S
8-Dechloro-9-chloro Desloratadine 8-Dechloro-9-chloro Desloratadine 117811-13-9 C19H19ClN2
Acyclovir L-Isoleucinate Acyclovir L-Isoleucinate 142963-63-1 C14H22N6O4
Carvedilol Bisalkylpyrocatechol IMpurity Carvedilol Bisalkylpyrocatechol IMpurity 1346602-98-9 C40H42N4O6
Decarboxyl Ofloxacin Decarboxyl Ofloxacin 123155-82-8 C17H20FN3O2
o-AdaMantylanisole o-AdaMantylanisole 43109-77-9 C17H22O
2-[[(5-hydroxy-1H-benziMidazol-2-yl)sulfinyl]Methyl]-3,5-diMethyl-1-4(1H)-pyridone 2-[[(5-hydroxy-1H-benziMidazol-2-yl)sulfinyl]Methyl]-3,5-diMethyl-1-4(1H)-pyridone C15H15N3O3S
Perindopril Impurity Perindopril Impurity
4-Acetoxyisophthalic Acid 4-Acetoxyisophthalic Acid 5985-26-2 C10H8O6
Ganciclovir Dipropionate Ganciclovir Dipropionate 86357-20-2 C15H21N5O6
IMp. A (EP): (RS)-2-Chloro-N-(2-Methylphenyl)-PropanaMide IMp. A (EP): (RS)-2-Chloro-N-(2-Methylphenyl)-PropanaMide 39084-88-3 C10H11Cl2NO
1β-Hydroxy-6α-Methyl-1,4-androstadiene-3,17-dione 1β-Hydroxy-6α-Methyl-1,4-androstadiene-3,17-dione 61919-52-6 C20H26O3
5-Fluoro ent-LaMivudine Acid D-Menthol Ester 5-Fluoro ent-LaMivudine Acid D-Menthol Ester 764659-79-2 C18H26FN3O4S
Tricyclo[3.3.1.13,7]decan-1-aMine, 3,5,7-triMethyl-, hydrochloride Tricyclo[3.3.1.13,7]decan-1-aMine, 3,5,7-triMethyl-, hydrochloride 15210-60-3 C13H24ClN
Methyl 2-CarbaMoylbenzoate Methyl 2-CarbaMoylbenzoate 90564-02-6 C9H9NO3
3-vinylphenyl ethyl(Methyl)-carbaMate 3-vinylphenyl ethyl(Methyl)-carbaMate 1346602-84-3 C12H15NO2
AMisulpride IMpurity D AMisulpride IMpurity D 71676-00-1 C16H25N3O4S
AFuroseMide IMp. A (EP) AFuroseMide IMp. A (EP)
(1R)-3,4-Dihydro-1-phenyl-2(1H)-isoquinolinecarboxylic acid ethyl ester (1R)-3,4-Dihydro-1-phenyl-2(1H)-isoquinolinecarboxylic acid ethyl ester 180468-41-1 C18H19NO2
2-[4-[(RS)-(4-Chlorophenyl)phenylMethyl]-piperazin-1-yl]ethanolDihydrochloride 2-[4-[(RS)-(4-Chlorophenyl)phenylMethyl]-piperazin-1-yl]ethanolDihydrochloride C19H25Cl3N2O
CAPECITABINE related substance USP CAPECITABINE related substance USP 1262133-68-5 C20H30FN3O9
4-AMino-N-[(1-ethyl-2-pyrrolidinyl)Methyl]-5-(ethylsulfonyl)- 2-MethoxybenzaMide N-Oxide 4-AMino-N-[(1-ethyl-2-pyrrolidinyl)Methyl]-5-(ethylsulfonyl)- 2-MethoxybenzaMide N-Oxide 71676-01-2 C17H27N3O5S
3-[(4-AMino-2-Methyl-5-pyriMidinyl)Methyl]-4-Methyl-5-[2-(sulfooxy)ethyl]thiazoliuM Inner Salt 3-[(4-AMino-2-Methyl-5-pyriMidinyl)Methyl]-4-Methyl-5-[2-(sulfooxy)ethyl]thiazoliuM Inner Salt 2380-61-2 C12H16N4O4S2
1,4-Bis-[4-[4-Methyl-3-[[4-(pyridin-3-yl)pyriMidin-2-yl]aMino]phenyl]carbaMoyl]benzylpiperazine 1,4-Bis-[4-[4-Methyl-3-[[4-(pyridin-3-yl)pyriMidin-2-yl]aMino]phenyl]carbaMoyl]benzylpiperazine 1365802-18-1 C52H48N12O2
[6R-[6α,7β(R*)]]-7-[(AMinophenylacetyl)aMino]-3-Methyl-8-oxo-5-thia-1-azabicyclo[4.2.0 [6R-[6α,7β(R*)]]-7-[(AMinophenylacetyl)aMino]-3-Methyl-8-oxo-5-thia-1-azabicyclo[4.2.0 79750-46-2 C16H17N3O4S
SalMeterol EP IMpurity D SalMeterol EP IMpurity D 1391052-04-2 C34H47NO7
3-Pyridinecarboxylic Acid 2-AMinoethyl Ester Dihydrochloride 3-Pyridinecarboxylic Acid 2-AMinoethyl Ester Dihydrochloride 87330-70-9 C8H11ClN2O2
PeMetrexed EP IMpurity D PeMetrexed EP IMpurity D 144051-68-3 C25H28N6O9
SuMatriptan EP IMpurity F SuMatriptan EP IMpurity F 2074615-63-5 C13H17N3O2S
3-((butyryloxy)Methyl) 5-Methyl 4-(2',3'-dichlorophenyl)-2,6-diMethylpyridine-3,5-dicarboxylate 3-((butyryloxy)Methyl) 5-Methyl 4-(2',3'-dichlorophenyl)-2,6-diMethylpyridine-3,5-dicarboxylate 188649-48-1 C21H21Cl2NO6
Bis Valacyclovir (~90%) Bis Valacyclovir (~90%) 1356019-51-6 C27H40N12O8
Flupirtine DiMer Flupirtine DiMer 1417916-52-9 C30H32F2N8O4
(S)-2-((R)-1-(3,5-bis(trifluoroMethyl)phenyl)ethoxy)-4-benzylMorpholin-3-one (S)-2-((R)-1-(3,5-bis(trifluoroMethyl)phenyl)ethoxy)-4-benzylMorpholin-3-one 327623-36-9 C21H19F6NO3
3-(5-Methyl-3-phenylisoxazol-4-yl)benzenesulfonaMide 3-(5-Methyl-3-phenylisoxazol-4-yl)benzenesulfonaMide 2304623-36-5 C16H14N2O3S
(S)-2-(3,4-Difluorophenyl)oxirane (S)-2-(3,4-Difluorophenyl)oxirane 1006376-63-1 C8H6F2O
EsoMeprazole iMpurity EsoMeprazole iMpurity 1424857-86-2 C11H15NO3
AMoxicillin iMpurity L AMoxicillin iMpurity L C16H19N3O5S
AMoxicillin iMpurity L AMoxicillin iMpurity L C16H19N3O5S
Azilsartan iMpurity G Azilsartan iMpurity G
(R)-N-(1-(naphthalen-1-yl)ethyl)-3-(M-tolyl)propan-1-aMine (R)-N-(1-(naphthalen-1-yl)ethyl)-3-(M-tolyl)propan-1-aMine 253337-60-9 C22H25N
3-((3R,4R)-4-Methyl-3-(Methyl(7H-pyrrolo[2,3-d]pyriMidin-4-yl)aMino)piperidin-1-yl)-3-oxopropanaMide 3-((3R,4R)-4-Methyl-3-(Methyl(7H-pyrrolo[2,3-d]pyriMidin-4-yl)aMino)piperidin-1-yl)-3-oxopropanaMide 1675248-19-7 C16H22N6O2
Blonanserin iMpurity Blonanserin iMpurity 132810-83-4 C23H30FN3
Deferasirox iMpurity Deferasirox iMpurity 1688656-83-8 C42H28N6O8S
Lercanidipine iMpurity Lercanidipine iMpurity 320750-19-4 C37H43N3O6
AMpicillin EP IMpurity J AMpicillin EP IMpurity J 6489-58-3 C13H20N2O4S
Anastrozole IMpurity (alfa1 , alfa1, alfa3, alfa3-TetraMethyl-5-(1H-1,2,4-triazol-1-ylMethyl)-1,3-BenzenediacetaMide) Anastrozole IMpurity (alfa1 , alfa1, alfa3, alfa3-TetraMethyl-5-(1H-1,2,4-triazol-1-ylMethyl)-1,3-BenzenediacetaMide) 120512-04-1 C17H23N5O2
Anastrozole IMpurity (alfa1 , alfa1, alfa3, alfa3-TetraMethyl-5-(1H-1,2,4-triazol-1-ylMethyl)-1,3-BenzenediacetaMide) Anastrozole IMpurity (alfa1 , alfa1, alfa3, alfa3-TetraMethyl-5-(1H-1,2,4-triazol-1-ylMethyl)-1,3-BenzenediacetaMide) 120512-04-1 C17H23N5O2
CefathiaMidine Lactone CefathiaMidine Lactone 905712-22-3 C17H24N4O4S2
Cinacalcet IMpurity 9 Cinacalcet IMpurity 9 802918-36-1 C22H24F3N
Doxorubicin IMpurity B Doxorubicin IMpurity B 106401-68-7 C29H34BrNO11
EzetiMibe IMpurity B EzetiMibe IMpurity B
Fluconazole IMpurity [1, 3-Bis(1H-1, 2, 4-Triazole-1-yl)propan-2-one] Fluconazole IMpurity [1, 3-Bis(1H-1, 2, 4-Triazole-1-yl)propan-2-one] 1449785-88-9 C10H7F2N3O
HydroxyMethylidene thione HydroxyMethylidene thione 1320360-86-8 C15H18N4OS
Lansoprazole IMpurity I Lansoprazole IMpurity I
Lapatinib IMpurity 10 Lapatinib IMpurity 10 1152131-73-1 C26H17ClFN3O4
Metronidazole IMpurity D Metronidazole IMpurity D
PraMipexole IMpurity V (PraMipexole IMpurity Z) PraMipexole IMpurity V (PraMipexole IMpurity Z)
Prasugrel Acetyl IMpurity Prasugrel Acetyl IMpurity 1443034-67-0 C18H18FNO3S
Propofol IMpurity G Propofol IMpurity G
SalMeterol IMpurity A SalMeterol IMpurity A C25H37NO4
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