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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
1-Isobutyl-4-piperidone 1-Isobutyl-4-piperidone 72544-16-2 C9H17NO
Formoterol fumarate dihydrate Formoterol fumarate dihydrate 183814-30-4 C23H28N2O8
Chloramphenicol sodium succinate Chloramphenicol sodium succinate 982-57-0 C15H15Cl2N2O8.Na
Fluphenazine decanoate Fluphenazine decanoate 5002-47-1 C32H44F3N3O2S
GUANERAN GUANERAN 5581-52-2 C9H8N8O2S
BENZATHINE PENICILLINE G TETRAHYDRATE BENZATHINE PENICILLINE G TETRAHYDRATE 41372-02-5 C32H38N4O4S
DOTHIEPIN HCL DOTHIEPIN HCL 897-15-4 C19H22ClNS
4-(4-Chloro-benzyl)-2H-phthalazin-1-one 4-(4-Chloro-benzyl)-2H-phthalazin-1-one 53242-88-9 C15H11ClN2O
2,6-DIMETHYL-4-NITROSOPHENOL 2,6-DIMETHYL-4-NITROSOPHENOL 14818-35-0 C12H16O2
Milbemycin oxime Milbemycin oxime 129496-10-2 2C32H45NO7.2C31H43NO7
ALPRENOLOL HYDROCHLORIDE ALPRENOLOL HYDROCHLORIDE 13707-88-5 C15H24ClNO2
4-BUTYL-4-[HYDROXYMETHYL]-1,2-DIPHENYL-3,5-PYRAZOLIDINEDIONE HYDROGEN SUCCINATE [ESTER] 4-BUTYL-4-[HYDROXYMETHYL]-1,2-DIPHENYL-3,5-PYRAZOLIDINEDIONE HYDROGEN SUCCINATE [ESTER] 27470-51-5 C24H26N2O6
ENTEROKINASE ENTEROKINASE 9014-74-8 NULL
CHONDROITIN SULFATE B SODIUM SALT CHONDROITIN SULFATE B SODIUM SALT 54328-33-5 NULL
Calcium levulinate dihydrate Calcium levulinate dihydrate 5743-49-7 C10H18CaO8
alpha-Ethyl-2-oxo-1-pyrrolidineacetic acid alpha-Ethyl-2-oxo-1-pyrrolidineacetic acid 67118-31-4 C8H13NO3
Rilmenidine phosphate Rilmenidine phosphate 85409-38-7 C10H19N2O5P
Piretanide Piretanide 55837-27-9 C17H18N2O5S
Potassium trichloroammineplatinate (II) Potassium trichloroammineplatinate (II) 13820-91-2 Cl3H3KNPt
Disodium clodronate tetrahydrate Disodium clodronate tetrahydrate 88416-50-6 CH7Cl2NaO7P2
Framycetin sulphate Framycetin sulphate 4146-30-9 C23H48N6O17S
MOLGRASTIM MOLGRASTIM 99283-10-0
2-(4-Methoxybenzylamino)pyridine 2-(4-Methoxybenzylamino)pyridine 52818-63-0 C13H14N2O
3-METHOXY-DL-TYROSINE 3-METHOXY-DL-TYROSINE 7636-26-2 C10H13NO4
4-(DIPHENYLMETHOXY)PIPERIDINE 4-(DIPHENYLMETHOXY)PIPERIDINE 58258-01-8 C18H21NO
N,N'-Dipropylurea N,N'-Dipropylurea 623-95-0 C7H16N2O
ISOPRENALINE SULFATE ISOPRENALINE SULFATE 6700-39-6 2C11H17NO3.2H2O.H2O4S
Spectinomycin sulfate tetrahydrate Spectinomycin sulfate tetrahydrate 64058-48-6 C14H26N2O11S
ACETYLSALICYLSALICYLIC ACID ACETYLSALICYLSALICYLIC ACID 530-75-6 C16H12O6
DIHYDROERGOCRISTINE MESYLATE DIHYDROERGOCRISTINE MESYLATE 24730-10-7 C36H45N5O8S
1-Cyanocyclohexaneacetic acid 1-Cyanocyclohexaneacetic acid 133481-09-1 C9H13NO2
2,4-DIAMINO-6-DIMETHYLAMINO-1,3,5-TRIAZINE 2,4-DIAMINO-6-DIMETHYLAMINO-1,3,5-TRIAZINE 1985-46-2 C5H10N6
CAPTOPRIL DISULFIDE CAPTOPRIL DISULFIDE 64806-05-9 C18H28N2O6S2
2-BENZYL-1,2,3,6,7,11B-HEXAHYDRO-4H-PYRAZION[2,1-A] ISOQUINOLINE-4-ONE 2-BENZYL-1,2,3,6,7,11B-HEXAHYDRO-4H-PYRAZION[2,1-A] ISOQUINOLINE-4-ONE 54761-87-4 C19H18N2O2
OXELADIN CITRATE OXELADIN CITRATE 52432-72-1 C20H33NO3.C6H8O7
3,4-Dihydro-7-(4-chlorobutoxy)-2(1H)-quinolinone 3,4-Dihydro-7-(4-chlorobutoxy)-2(1H)-quinolinone 120004-79-7 C13H16ClNO2
Sugammadex sodium Impurity 46 Sugammadex sodium Impurity 46
Tenofovir Impurity 103 Tenofovir Impurity 103
Cabozantinib impurity 44 Cabozantinib impurity 44
Cabozantinib impurity 40 Cabozantinib impurity 40
Cabozantinib impurity 74 Cabozantinib impurity 74
5-hydroxy-N,1,2-trimethyl-1H-indole-3-carboxamide 5-hydroxy-N,1,2-trimethyl-1H-indole-3-carboxamide
Doxofylline Impurity 25 Doxofylline Impurity 25
Dapoxetine impurity 62 Dapoxetine impurity 62
Dapoxetine impurity 56 Dapoxetine impurity 56
Oseltamivir Impurity 94 Oseltamivir Impurity 94
Oseltamivir Impurity 82 Oseltamivir Impurity 82
Oseltamivir Impurity 74 Oseltamivir Impurity 74
Uridine, 5'-(2-methylpropanoate) (9CI) Uridine, 5'-(2-methylpropanoate) (9CI) 886538-48-3 C13H18N2O7
Dapagliflozin Impurity 47 Dapagliflozin Impurity 47
Crisaborole Impurity 17 Crisaborole Impurity 17
Crisaborole Impurity 19 Crisaborole Impurity 19
1,5-Pentanedione, 1-(2-fluorophenyl)-5-[(4S)-2-oxo-4-phenyl-3-oxazolidinyl]- 1,5-Pentanedione, 1-(2-fluorophenyl)-5-[(4S)-2-oxo-4-phenyl-3-oxazolidinyl]- 2514695-40-8 C20H18FNO4
4-ethoxy-3-(4-pyridyl)-3-buten-2-one 4-ethoxy-3-(4-pyridyl)-3-buten-2-one 88349-61-5 C11H13NO2
2H-3-Benzazepin-2-one, 3-[3-[[[(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl]methylamino]propyl]-1,3,4,5-tetrahydro-5-hydroxy-7,8-dimethoxy- 2H-3-Benzazepin-2-one, 3-[3-[[[(7S)-3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]methyl]methylamino]propyl]-1,3,4,5-tetrahydro-5-hydroxy-7,8-dimethoxy- 2253977-80-7 C27H36N2O6
Benzeneacetic acid, 3-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]butyl]-α,α-dimethyl-, methyl ester Benzeneacetic acid, 3-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]butyl]-α,α-dimethyl-, methyl ester 1187954-56-8 C33H41NO4
N-[2-(methylthio)ethyl]-2-[(3,3,3-trifluoropropyl)thio]-Adenosine 5''-(hydrogen P-1H-imidazol-1-ylphosphonate) N-[2-(methylthio)ethyl]-2-[(3,3,3-trifluoropropyl)thio]-Adenosine 5''-(hydrogen P-1H-imidazol-1-ylphosphonate) 1054332-15-8 C19H25F3N7O6PS2
N-[5-(4-Bromophenyl)-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N''-propyl-sulfamide N-[5-(4-Bromophenyl)-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N''-propyl-sulfamide 2211059-00-4 C19H21BrN6O4S
Isomer 1 of Tazobactam Impurity 3 Isomer 1 of Tazobactam Impurity 3
Ceftiofur USP Impurity I Ceftiofur USP Impurity I
Cephalexin Degradation Impurity A Cephalexin Degradation Impurity A
Azlocillin Impurity 8 Azlocillin Impurity 8
Pregabalin-8687（mixture of 4 isomers） Pregabalin-8687（mixture of 4 isomers）
7-(2-chloropropanoyl)-5H-chromeno[2,3-b]pyridin-5-one 7-(2-chloropropanoyl)-5H-chromeno[2,3-b]pyridin-5-one
1-(5H-chromeno[2,3-b]pyridin-7-yl)-2-methoxypropan-1-one 1-(5H-chromeno[2,3-b]pyridin-7-yl)-2-methoxypropan-1-one
(E)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine (E)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine
Dolutegravir Impurity C Dolutegravir Impurity C 1802141-49-6 C22H23F2N3O5
Adefovir Dipivoxil Impurity 24 Adefovir Dipivoxil Impurity 24 116384-58-8 C14H23O7PS
Dapoxetine Impurity 68 Dapoxetine Impurity 68 119357-48-1 C19H18O
Tobramycin Impurity Tobramycin Impurity 74501-86-3 C18H35N5O8
Peramivir Impurity 24 Peramivir Impurity 24
2-CHLORO-6-AMINO-9-(2',3',5'-TRI-O-ACETYL--D-RIBOFURANOSYL)PURINE 2-CHLORO-6-AMINO-9-(2',3',5'-TRI-O-ACETYL--D-RIBOFURANOSYL)PURINE 79999-39-6 C16H18ClN5O7
D(-)-AMETHOPTERIN D(-)-AMETHOPTERIN 51865-79-3 C20H22N8O5
1,3-dihydro-4-methyl-2H-1,5-benzodiazepin-2-one 1,3-dihydro-4-methyl-2H-1,5-benzodiazepin-2-one 6276-48-8 C10H10N2O
(E)-2-methoxy-4-(prop-1-enyl)phenol (E)-2-methoxy-4-(prop-1-enyl)phenol 5932-68-3 C10H12O2
3-amino-5-[(methylthio)methyl]oxazolidin-2-one 3-amino-5-[(methylthio)methyl]oxazolidin-2-one 25517-72-0 C5H10N2O2S
Phosphonic acid, [[2-(6-amino-9H-purin-9-yl)propoxy]methyl]- (9CI) Phosphonic acid, [[2-(6-amino-9H-purin-9-yl)propoxy]methyl]- (9CI) 107021-20-5 C9H14N5O4P
Sitagliptin EP Impurity 7 Sitagliptin EP Impurity 7
Sitagliptin EP Impurity H Sitagliptin EP Impurity H
7-Benzofurancarboxamide, 4-amino-5-chloro-2,3-dihydro-3-hydroxy-N-[1-(3-methoxypropyl)-4-piperidinyl]- 7-Benzofurancarboxamide, 4-amino-5-chloro-2,3-dihydro-3-hydroxy-N-[1-(3-methoxypropyl)-4-piperidinyl]- 2636673-48-6 C18H26ClN3O4
Beprostatin impurity 4 Beprostatin impurity 4
cis-5-chloro-2,3,3a,12b-tetrahydro-2-methyl-1H-dibenz[2,3:6,7]oxepino[4,5-c]pyrrole cis-5-chloro-2,3,3a,12b-tetrahydro-2-methyl-1H-dibenz[2,3:6,7]oxepino[4,5-c]pyrrole 65621-78-5 C17H16ClNO
methyl tosylcarbamate methyl tosylcarbamate 14437-03-7 C9H11NO4S
(1R,2R,4S,5S,7s,9r)-9-butyl-9-methyl-7-((2-phenylacryloyl)oxy)-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-9-ium (1R,2R,4S,5S,7s,9r)-9-butyl-9-methyl-7-((2-phenylacryloyl)oxy)-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-9-ium 786598-71-8 C21H28NO3+
(+)-2-Ethoxy-4-(N-3-Methyl-1(S)-(2-(1-Piperidinyl)Phenyl)-Butyl)Carbamoylmethyl) (+)-2-Ethoxy-4-(N-3-Methyl-1(S)-(2-(1-Piperidinyl)Phenyl)-Butyl)Carbamoylmethyl) 147770-06-7 C29H40N2O4
4-Chloro-2-(chloromethyl)-3-Methyl Pyridine Hydrochloride 4-Chloro-2-(chloromethyl)-3-Methyl Pyridine Hydrochloride 152402-97-6 C7H8Cl3N
4-(3-CYANO-2-METHYLPROPIONYL)ACETAMILIDE 4-(3-CYANO-2-METHYLPROPIONYL)ACETAMILIDE 42075-21-8
Erythromycin, 6-O-Methyl-2',4'-Bis-O-(Trimethylsilyl)-, 9-[O-(1-Methoxy-1-Methylethyl)Oxime] Erythromycin, 6-O-Methyl-2',4'-Bis-O-(Trimethylsilyl)-, 9-[O-(1-Methoxy-1-Methylethyl)Oxime] 119699-81-9 C48H94N2O14Si2
(R)-8-(3-aminopiperidin-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-7-(3-oxobutyl)-3,7-dihydro-1H-purine-2,6-dione (R)-8-(3-aminopiperidin-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-7-(3-oxobutyl)-3,7-dihydro-1H-purine-2,6-dione
Isavuconazole Impurity 37 Isavuconazole Impurity 37
1-(3-((2,4-dimethylphenyl)thio)phenyl)piperazine hydrochloride 1-(3-((2,4-dimethylphenyl)thio)phenyl)piperazine hydrochloride 2137793-92-9
Apixaban impurity 66S Apixaban impurity 66S
Aatrombopag Impurity 17 Aatrombopag Impurity 17 1268118-96-2 C7H4BrClN2S2
(R)-(-)-2-AMINOBUTANAMIDE HYDROCHLORIDE, 97% (R)-(-)-2-AMINOBUTANAMIDE HYDROCHLORIDE, 97% 103765-03-3 C4H11ClN2O
Flomoxef Impurity 20 Sodium Salt Flomoxef Impurity 20 Sodium Salt 2095697-77-9 C15H18F2N6O7S2
((2R,3S,4R)-3,4,5-trihydroxytetrahydrofuran-2-yl)methyl isobutyrate ((2R,3S,4R)-3,4,5-trihydroxytetrahydrofuran-2-yl)methyl isobutyrate 2591381-21-2 C9H16O6
3-Thiophenecarboxylic acid, 4-(bromomethyl)-2-[[(2,6-difluorophenyl)methyl](propoxycarbonyl)amino]-5-(4-nitrophenyl)-, ethyl ester 3-Thiophenecarboxylic acid, 4-(bromomethyl)-2-[[(2,6-difluorophenyl)methyl](propoxycarbonyl)amino]-5-(4-nitrophenyl)-, ethyl ester 2591260-07-8 C25H23BrF2N2O6S
Cyclohexanecarboxylic acid, 2-[[[4-[4-(1,2-benzisothiazol-3-yl)-1-piperazinyl]butyl]amino]carbonyl]-, (1R,2S)-rel- Cyclohexanecarboxylic acid, 2-[[[4-[4-(1,2-benzisothiazol-3-yl)-1-piperazinyl]butyl]amino]carbonyl]-, (1R,2S)-rel- 190582-37-7 C23H32N4O3S
Ivabradine Impurity II Ivabradine Impurity II
(1R,2R,4S,5S,7r)-9-methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-7-yl 2-hydroxy-2,2-di(thiophen-2-yl)acetate (1R,2R,4S,5S,7r)-9-methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-7-yl 2-hydroxy-2,2-di(thiophen-2-yl)acetate 792155-94-3 C18H19NO4S2
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