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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Crisaborole Impurity 14 Crisaborole Impurity 14
Benzonitrile, 4-[(1E)-4-(dimethylamino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxymethyl)- Benzonitrile, 4-[(1E)-4-(dimethylamino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxymethyl)- 1370643-23-4 C20H21FN2O
Latamoxef impurity B Latamoxef impurity B
(9alpha,13alpha,14alpha)-3-methoxymorphinan-17-carbaldehyde (9alpha,13alpha,14alpha)-3-methoxymorphinan-17-carbaldehyde 28973-48-0 C18H23NO2
(R)-De(trifluoromethyl) Fluoxetine Hydrochloride (R)-De(trifluoromethyl) Fluoxetine Hydrochloride 1212215-97-8 C16H20ClNO
(1R,5S)-1-phenyl-3-oxabicyclo[3.1.0]hexan-2-one (1R,5S)-1-phenyl-3-oxabicyclo[3.1.0]hexan-2-one 96847-52-8 C11H10O2
(1R,1'R,2S,2'S)-2,2'-[1,5-pentanediylbis[oxy(3-oxo-3,1-propanediyl)]]bis[1-[(3,4-dimethoxyphenyl)methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-Isoquinolinium Benzenesulfonate (1R,1'R,2S,2'S)-2,2'-[1,5-pentanediylbis[oxy(3-oxo-3,1-propanediyl)]]bis[1-[(3,4-dimethoxyphenyl)methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-Isoquinolinium Benzenesulfonate 96946-46-2 C59H77N2O15S+
(2R,3R,4R,5R)-2-(4-amino-2-oxo-1,3,5-triazin-1(2H)-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-3-yl acetate (2R,3R,4R,5R)-2-(4-amino-2-oxo-1,3,5-triazin-1(2H)-yl)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-3-yl acetate C10H14N4O6
12-ethyl-8-methyl-9-oxo-7-propionyl-9,11-dihydroindolizino[1,2-b]quinolin-2-yl [1,4'-bipiperidine]-1'-carboxylate 12-ethyl-8-methyl-9-oxo-7-propionyl-9,11-dihydroindolizino[1,2-b]quinolin-2-yl [1,4'-bipiperidine]-1'-carboxylate 176515-52-9 C32H38N4O4
4-amino-5-chloro-N-(1-propylpiperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 4-amino-5-chloro-N-(1-propylpiperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide C17H24ClN3O2
Ceftazidime Impurity D Ceftazidime Impurity D
Ceftazidime Sulfoxide Impurity Ceftazidime Sulfoxide Impurity
Tofacitinib Impurity Y Tofacitinib Impurity Y
5-amino-6-chloro-2-(propylthio)pyrimidin-4-ol 5-amino-6-chloro-2-(propylthio)pyrimidin-4-ol C7H10ClN3OS
Labetalol EP impurity G Labetalol EP impurity G
2-(2-NITROPHENYL)ETHANAMINE 2-(2-NITROPHENYL)ETHANAMINE 33100-15-1 C8H10N2O2
CLOZAPINE-D3 CLOZAPINE-D3 1215691-72-7 C18H19ClN4
Bumetanide iMpurity F Bumetanide iMpurity F
IODIXANOL RELATED COMPOUND D (50 MG) (5-[ACETYL(2-HYDROXY-3-METHYLPROPYL)AMINO]-N,N'-BIS(2,3-DIHYDROXYPROPYL)2,4,6-TRIIODO-1,3-BENZE-NEDICARBOXAMIDE) IODIXANOL RELATED COMPOUND D (50 MG) (5-[ACETYL(2-HYDROXY-3-METHYLPROPYL)AMINO]-N,N'-BIS(2,3-DIHYDROXYPROPYL)2,4,6-TRIIODO-1,3-BENZE-NEDICARBOXAMIDE) 89797-00-2 C20H28I3N3O9
NIMODIPINE RELATED COMPOUND B (50 MG) (BIS(2-METHOXYETHYL) 2,6-DIMETHYL-4-(3-NITROPHE-NYL)-1,4-DIHYDROPYRIDINE-3,5-DICARBOXYLATE) (AS) NIMODIPINE RELATED COMPOUND B (50 MG) (BIS(2-METHOXYETHYL) 2,6-DIMETHYL-4-(3-NITROPHE-NYL)-1,4-DIHYDROPYRIDINE-3,5-DICARBOXYLATE) (AS) 70172-96-2 C21H26N2O8
1-METHYL-2-PHENOXYETHYLAMINE 1-METHYL-2-PHENOXYETHYLAMINE 35205-54-0 C9H13NO
SULPIRIDE IMPURITY B SULPIRIDE IMPURITY B
3-(7,8-dimethoxy-2-oxo-1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)-N-(((S)-3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)-N-methylpropan-1-amine oxide 3-(7,8-dimethoxy-2-oxo-1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)-N-(((S)-3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)-N-methylpropan-1-amine oxide 2511244-97-4 C27H36N2O6
2,4,6,3',5'-pentamethoxybiphenyl 2,4,6,3',5'-pentamethoxybiphenyl 84212-55-5 C17H20O5
Labetalol EP Impurity I Labetalol EP Impurity I
(Asp4)-Carbetocin (Impurity G) (Asp4)-Carbetocin (Impurity G)
Sulfamide, N-[5-(4-bromophenyl)-6-[2-[(5-chloro-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N'-propyl- Sulfamide, N-[5-(4-bromophenyl)-6-[2-[(5-chloro-2-pyrimidinyl)oxy]ethoxy]-4-pyrimidinyl]-N'-propyl- 2443747-63-3 C19H20BrClN6O4S
methyl 3-oxo1,2-benzisothiazole-2(3H)-acetate 1,1-dioxide methyl 3-oxo1,2-benzisothiazole-2(3H)-acetate 1,1-dioxide 6639-62-9 C10H9NO5S
(6R-cis)-3-(hydroxymethyl)-7-methoxy-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (6R-cis)-3-(hydroxymethyl)-7-methoxy-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 54333-94-7 C15H16N2O6S2
5-acetyl-1,3-phenylene bis(dimethylcarbamate) 5-acetyl-1,3-phenylene bis(dimethylcarbamate) 81732-48-1 C14H18N2O5
Oseltamivir Impurity L Oseltamivir Impurity L
1,4-Naphthalenediol, 2-methyl-, 4-acetate 1,4-Naphthalenediol, 2-methyl-, 4-acetate 110327-29-2 C13H12O3
Oseltamivir Impurity 105 Oseltamivir Impurity 105
Oseltamivir Impurity 77 Oseltamivir Impurity 77
Imidapril Impurity 2 Imidapril Impurity 2
Betamethasone EP Impurity G Betamethasone EP Impurity G 85700-75-0 C22H30O5
Crisaborole Impurity ABCDEFGHJKL Crisaborole Impurity ABCDEFGHJKL
3-Azetidinecarboxylic acid, 1-[(4-acetyl-2-ethylphenyl)methyl]- 3-Azetidinecarboxylic acid, 1-[(4-acetyl-2-ethylphenyl)methyl]- 2474774-17-7 C15H19NO3
Benazepril Related Compound F Benazepril Related Compound F
2-(N,N-DIETHYLAMINO)-4,6-DICHLOROTRIAZINE 2-(N,N-DIETHYLAMINO)-4,6-DICHLOROTRIAZINE 2401-64-1 C5H6Cl2N4
(S)-4-Chloro-1,3-butanediol (S)-4-Chloro-1,3-butanediol 139013-68-6 C4H9ClO2
6-CHLORO-1-METHYLURACIL 6-CHLORO-1-METHYLURACIL 31737-09-4 C5H5ClN2O2
5-(Propylthio)-1H-benzimidazol-2-amine 5-(Propylthio)-1H-benzimidazol-2-amine 80983-36-4 C10H13N3S
Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate Ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate 179688-26-7 C15H21NO8
Hexyl methanesulfonate Hexyl methanesulfonate 16156-50-6 C7H16O3S
5-CHLOROTHIOPHENE-3-CARBOXYLIC ACID 5-CHLOROTHIOPHENE-3-CARBOXYLIC ACID 36157-42-3 C5H3ClO2S
(S)-(+)-1-[(4-Chlorophenyl)phenylmethyl]piperazine (S)-(+)-1-[(4-Chlorophenyl)phenylmethyl]piperazine 439858-21-6 C17H19ClN2
2,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one 2,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one 133330-61-7 C14H9Cl2NO
2-Isopropyl-6-propylphenol (Propofol Impurity O) 2-Isopropyl-6-propylphenol (Propofol Impurity O) 74663-48-2 C12H18O
3-Methyl-2-(3,4-dimethoxyphenyl)butyronitrile 3-Methyl-2-(3,4-dimethoxyphenyl)butyronitrile 20850-49-1 C13H17NO2
HYDROXY ITRACONAZOLE HYDROXY ITRACONAZOLE 112559-91-8 C35H38Cl2N8O5
1-HEXADECANOYL-2-(P-NITROPHENOXYSUCCINOYL)-SN-GLYCERYL-3-PHOSPHORYLCHOLINE 1-HEXADECANOYL-2-(P-NITROPHENOXYSUCCINOYL)-SN-GLYCERYL-3-PHOSPHORYLCHOLINE 170569-87-6 C16H12F3N3O2S
N-methyl-N-(4-nitrophenyl)-2-(piperazin-1-yl)acetamide N-methyl-N-(4-nitrophenyl)-2-(piperazin-1-yl)acetamide 1038972-16-5 C13H18N4O3
1,4-BIS[3,4-DIHYDRO-2(1H)-QUINOLINON-7-OXY]BUTANE 1,4-BIS[3,4-DIHYDRO-2(1H)-QUINOLINON-7-OXY]BUTANE 882880-12-8 C22H24N2O4
2,3'-Bipyridine, 5-chloro-3-[4-(methylsulfonyl)phenyl]-, hydrochloride (1:1) 2,3'-Bipyridine, 5-chloro-3-[4-(methylsulfonyl)phenyl]-, hydrochloride (1:1) 202409-39-0 C17H14Cl2N2O2S
1,1'-((methylenebis(4-methoxy-3,1-phenylene))bis(2-(dimethylamino)ethane-1,1-diyl))dicyclohexanol 1,1'-((methylenebis(4-methoxy-3,1-phenylene))bis(2-(dimethylamino)ethane-1,1-diyl))dicyclohexanol
2-amino-4-(2-(benzyl(1-(4-methoxyphenyl)propan-2-yl)amino)-1-hydroxyethyl)phenol 2-amino-4-(2-(benzyl(1-(4-methoxyphenyl)propan-2-yl)amino)-1-hydroxyethyl)phenol
Peramivir Deacetyl Impurity Peramivir Deacetyl Impurity
Empagliflozin Impurity 116 Empagliflozin Impurity 116
(3R,5aS)-5,8-dioxooctahydro-5H-pyrrolo[1,2-a]thiazolo[3,2-d]pyrazine-3-carboxylic acid (3R,5aS)-5,8-dioxooctahydro-5H-pyrrolo[1,2-a]thiazolo[3,2-d]pyrazine-3-carboxylic acid
Phospholipid Impurity 1(DPPE-MPEG5000 Impurity 1) Phospholipid Impurity 1(DPPE-MPEG5000 Impurity 1)
Carbazochrome Sodium Sulfonate Impurity 4 Carbazochrome Sodium Sulfonate Impurity 4
Empagliflozin Furanose Impurity Empagliflozin Furanose Impurity
Rosuvastatin Impurity 144 Rosuvastatin Impurity 144
Cetrorelix Impurity 11 Cetrorelix Impurity 11
Cetrorelix Impurity 4 (8-D-Arg) Cetrorelix Impurity 4 (8-D-Arg)
Cetrorelix Impurity 1 (+L-Arg) Cetrorelix Impurity 1 (+L-Arg)
Peramivir Intermediate Impurity 36 Peramivir Intermediate Impurity 36
Peramivir Intermediate Impurity 41 Peramivir Intermediate Impurity 41
Peramivir Impurity 999 Peramivir Impurity 999
Palonosetron impurity 20XH Palonosetron impurity 20XH
Apixaban Impurity 89 Apixaban Impurity 89
Levofloxacin benzopazine impurity Levofloxacin benzopazine impurity
Bumetanide Impurity 14 Bumetanide Impurity 14 1431501-10-8 C21H27NO3
Trans,rel-(1R,4R)-4-{[(2-Aminophenyl)methyl]amino}cyclohexan-1-ol Hydrochloride Trans,rel-(1R,4R)-4-{[(2-Aminophenyl)methyl]amino}cyclohexan-1-ol Hydrochloride
Sugammadex Sodium Impurity 08 Sugammadex Sodium Impurity 08
2-bromo-3-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzonitrile 2-bromo-3-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzonitrile
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2412953-12-7 C72H112O49S8
4a(2H)-Isoquinolinol, octahydro-4-(4-methoxyphenyl)-2-methyl- 4a(2H)-Isoquinolinol, octahydro-4-(4-methoxyphenyl)-2-methyl- 2568340-30-5 C17H25NO2
3-Quinolinecarbonitrile, 4-[(2,4-dichloro-5-hydroxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]- 3-Quinolinecarbonitrile, 4-[(2,4-dichloro-5-hydroxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]- 2468737-92-8 C25H27Cl2N5O3
Uridine, 4-oxime, 5'-(2-methylpropanoate), (4E)- Uridine, 4-oxime, 5'-(2-methylpropanoate), (4E)- 2492423-30-8 C13H19N3O7
Empagliflozin Furanose Impurity Empagliflozin Furanose Impurity
Tazobactam Impurity XTE Tazobactam Impurity XTE
1,5-Benzothiazepin-4(5H)-one, 3-(acetyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-, (2S-trans)- 1,5-Benzothiazepin-4(5H)-one, 3-(acetyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-, (2S-trans)- 111188-70-6 C22H26N2O4S
1H-Benzimidazole-2-sulfinicacid(9CI) 1H-Benzimidazole-2-sulfinicacid(9CI) 58536-71-3 C7H6N2O2S
1(3H)-Isobenzofuranone,3-methyl-(9CI) 1(3H)-Isobenzofuranone,3-methyl-(9CI) 3453-64-3 C9H8O2
3-ETHOXY-4-METHOXYBENZOIC ACID 3-ETHOXY-4-METHOXYBENZOIC ACID 2651-55-0 C10H12O4
4-hydroxyurapidil 4-hydroxyurapidil 88733-12-4 C20H29N5O4
2-chloro-4-nitrophenyl-N-acetylglucosaminide 2-chloro-4-nitrophenyl-N-acetylglucosaminide 103614-82-0 C14H17ClN2O8
desisopropylprocaterol desisopropylprocaterol 63483-95-4 C13H16N2O3
10-bromocarbamazepine 10-bromocarbamazepine 59690-97-0 C15H11BrN2O
ethyl apovincaminate ethyl apovincaminate 42971-12-0 C22H26N2O2
ALS 8123 ALS 8123 81148-15-4 C15H23NO4
Ro 14-7437 Ro 14-7437 78756-03-3 C15H15N3O3
4-(2-Cyanophenyl)benzaldehyde 4-(2-Cyanophenyl)benzaldehyde 135689-93-9 C14H9NO
(R)-SN-38 (R)-SN-38 647852-82-2 C22H20N2O5
5'-Deoxy-5-fluoro-N4-(isopentyloxycarbonyl)cytidine 5'-Deoxy-5-fluoro-N4-(isopentyloxycarbonyl)cytidine 162204-30-0 C15H22FN3O6
4-[(2,3-Dihydro-5,6-dimethoxy-1H-inden-2-yl)methyl]-1-(phenylmethyl)piperidine Hydrochloride 4-[(2,3-Dihydro-5,6-dimethoxy-1H-inden-2-yl)methyl]-1-(phenylmethyl)piperidine Hydrochloride 1034439-57-0 C24H32ClNO2
5-(aminosulfonyl)-2-methoxybenzamide 5-(aminosulfonyl)-2-methoxybenzamide 52395-25-2 C8H10N2O4S
PIPERIDINE-3-CARBOXYLIC ACID (2,6-DIMETHYL-PHENYL)-AMIDE PIPERIDINE-3-CARBOXYLIC ACID (2,6-DIMETHYL-PHENYL)-AMIDE 337488-90-1 C14H20N2O
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