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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Levofloxacin benzopazine impurity Levofloxacin benzopazine impurity
Bumetanide Impurity 14 Bumetanide Impurity 14
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
Isavuconazole Impurity 46 Isavuconazole Impurity 46
5-(1-((5,6-diethyl-2,3-dihydro-1H-inden-2-yl)amino)-2-hydroxyethyl)-8-hydroxyquinolin-2(1H)-one 5-(1-((5,6-diethyl-2,3-dihydro-1H-inden-2-yl)amino)-2-hydroxyethyl)-8-hydroxyquinolin-2(1H)-one 2226428-25-5 C24H28N2O3
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2740235-22-5 C13H22N2O5
2-(4-ethylpiperazin-1-yl)-4-(2-fluorophenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine 2-(4-ethylpiperazin-1-yl)-4-(2-fluorophenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine C23H30FN3
1-Naphthalenamine, 4-(2,3-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-, (1R,4S)-rel- 1-Naphthalenamine, 4-(2,3-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-, (1R,4S)-rel- 2184053-08-3 C17H17Cl2N
Rosuvastatin Impurity 152 Rosuvastatin Impurity 152
1-[4-(2-AZEPAN-1-YL-ETHOXY)-BENZYL]-5-BENZYLOXY-2-(4-BENZYLOXY-PHENYL)-3-METHYL-1H-INDOLE 1-[4-(2-AZEPAN-1-YL-ETHOXY)-BENZYL]-5-BENZYLOXY-2-(4-BENZYLOXY-PHENYL)-3-METHYL-1H-INDOLE 198480-21-6 C44H46N2O3
6-Heptenoic acid, 7-[2-cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-, 1,1-dimethylethyl ester, (3S,5R,6E)- 6-Heptenoic acid, 7-[2-cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-, 1,1-dimethylethyl ester, (3S,5R,6E)- 2273873-66-6 C29H32FNO4
2H-1,4-Benzoxazin-3(4H)-one, 8-(2-chloro-1-hydroxyethyl)-6-(phenylmethoxy)- 2H-1,4-Benzoxazin-3(4H)-one, 8-(2-chloro-1-hydroxyethyl)-6-(phenylmethoxy)- 2383660-53-3 C17H16ClNO4
4-chloro-N-(3-chloro-4-fluorophenyl)-8-nitroquinazolin-7-amine 4-chloro-N-(3-chloro-4-fluorophenyl)-8-nitroquinazolin-7-amine
Isavuconazole Impurity 40 Isavuconazole Impurity 40
(2R,3S,4R,5R,6S)-2-((R)-1,2-dihydroxyethyl)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)methyl)-4-methylphenyl)tetrahydro-2H-pyran-3,4,5-triol (2R,3S,4R,5R,6S)-2-((R)-1,2-dihydroxyethyl)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)methyl)-4-methylphenyl)tetrahydro-2H-pyran-3,4,5-triol
2,3'-Bipyridine, 5-chloro-6'-methyl-3-[4-(methylsulfonyl)phenyl]-, 1,1'-dioxide 2,3'-Bipyridine, 5-chloro-6'-methyl-3-[4-(methylsulfonyl)phenyl]-, 1,1'-dioxide 2724840-93-9 C18H15ClN2O4S
Vitamin K1 Impurity C Vitamin K1 Impurity C
4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-((5-methylpyridin-3-yl)methyl)piperidine 1-oxide 4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-((5-methylpyridin-3-yl)methyl)piperidine 1-oxide
1,3-Dioxo-2-isoindolineaceticacid 1,3-Dioxo-2-isoindolineaceticacid 6296-53-3 C10H7NO4
1-(4-Bromo-2-(hydroxymethyl)phenyl)-4-(dimethylamino)-1-(4-fluorophenyl)butan-1-olhydrochloride 1-(4-Bromo-2-(hydroxymethyl)phenyl)-4-(dimethylamino)-1-(4-fluorophenyl)butan-1-olhydrochloride 488148-10-3 C19H23BrFNO2
Bisoprolol Impurity 42 Bisoprolol Impurity 42
Peramivir Impurity 31(R) Peramivir Impurity 31(R)
Roxatidine Impurity 10 Roxatidine Impurity 10
2-methyl-4-(((2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraen-1-yl)oxy)naphthalen-1-ol 2-methyl-4-(((2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraen-1-yl)oxy)naphthalen-1-ol
2H-Pyrido[3,4-h]-1,4-benzoxazin-3(4H)-one, 7,8,9,10-tetrahydro-6,10-dihydroxy-8-[2-(4-methoxyphenyl)-1,1-dimethylethyl]- 2H-Pyrido[3,4-h]-1,4-benzoxazin-3(4H)-one, 7,8,9,10-tetrahydro-6,10-dihydroxy-8-[2-(4-methoxyphenyl)-1,1-dimethylethyl]- 2727170-18-3 C22H26N2O5
Vildagliptin Chloroacetyl Nitrile (R)-Isomer Vildagliptin Chloroacetyl Nitrile (R)-Isomer 565452-98-4 C7H9ClN2O
Nirmatrelvir Impurity 5 Nirmatrelvir Impurity 5
Brivaracetam Impurity 119 Brivaracetam Impurity 119
Perospirone Impurity 27 Perospirone Impurity 27
Paxlovid Impurity 11 Paxlovid Impurity 11
3-(2-(cyclopent-3-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide 3-(2-(cyclopent-3-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide
Timolol maleate impurity 02 Timolol maleate impurity 02
Fondaparinux sodium impurity 19 Fondaparinux sodium impurity 19
Avatrombopag Impurity 59 Avatrombopag Impurity 59
Lasmiditan Impurity 3 Lasmiditan Impurity 3
Olaparib Adduct Impurity Olaparib Adduct Impurity
8-chloro-11-(piperidin-4-ylidene)-11H-benzo[5,6]cyclohepta[1,2-b] pyridine 8-chloro-11-(piperidin-4-ylidene)-11H-benzo[5,6]cyclohepta[1,2-b] pyridine 2514965-36-5
Febuxostat impurity EOX Febuxostat impurity EOX
2-METHYL-4-HYDROXY-2H-1,2-BENZOTHIAZINE-3-CARBOXYLIC METHYL ESTER-1,1-DIOXIDE 2-METHYL-4-HYDROXY-2H-1,2-BENZOTHIAZINE-3-CARBOXYLIC METHYL ESTER-1,1-DIOXIDE 35511-15-0 C11H11NO5S
Olodaterol Impurity 26 Olodaterol Impurity 26
2H-3-Benzazepin-2-one, 3-[3-[[(2S)-3-chloro-2-(3,4-dimethoxyphenyl)propyl]methylamino]propyl]-1,3,4,5-tetrahydro-7,8-dimethoxy- 2H-3-Benzazepin-2-one, 3-[3-[[(2S)-3-chloro-2-(3,4-dimethoxyphenyl)propyl]methylamino]propyl]-1,3,4,5-tetrahydro-7,8-dimethoxy- 2768438-46-4 C27H37ClN2O5
Ethacridine Impurity 5 Ethacridine Impurity 5 869002-00-6
Olodaterol Impurity 29 Olodaterol Impurity 29
Elagolix Impurity 40 Elagolix Impurity 40
8-chloro-6-fluoro-1-((1R,2S)-2-fluorocyclopropyl)-7-hydroxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 8-chloro-6-fluoro-1-((1R,2S)-2-fluorocyclopropyl)-7-hydroxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 2365490-44-2 C13H8ClF2NO4
[3-[[[2-(Diaminomethyleneamino)-4-thiazolyl]methyl]thio]propionyl]sulfamide [3-[[[2-(Diaminomethyleneamino)-4-thiazolyl]methyl]thio]propionyl]sulfamide 106433-44-7 C8H14N6O3S3
3-Dechloro Sertraline Hydrochloride 3-Dechloro Sertraline Hydrochloride 79646-00-7 C17H19Cl2N
7-DeMethyl Ivabradine 7-DeMethyl Ivabradine 304462-60-0 C26H34N2O5
8-Dechloro-9-chloro Loratadine 8-Dechloro-9-chloro Loratadine 109537-11-3 C22H23ClN2O2
Acyclovir N-Ethyl-L-valinate Hydrochloride Acyclovir N-Ethyl-L-valinate Hydrochloride 1346617-49-9 C15H25ClN6O4
AMikacin B AMikacin B 48237-20-3 C22H44N6O12
Carboxy Gliclazide Carboxy Gliclazide 38173-52-3 C15H19N3O5S
Dehydro RifaxiMin Dehydro RifaxiMin 80621-76-7 C43H49N3O11
N,N'-Desethylene Levofloxacin Hydrochloride N,N'-Desethylene Levofloxacin Hydrochloride 151250-76-9 C16H18FN3O4
rac 3-Deacetyl-3-butanoyl Acebutolol Hydrochloride rac 3-Deacetyl-3-butanoyl Acebutolol Hydrochloride 57898-71-2 C20H33ClN2O4
rac Deoxy-O-desMethyl Venlafaxine rac Deoxy-O-desMethyl Venlafaxine 1346605-18-2 C16H25NO
2-Keto ZolpideM 2-Keto ZolpideM 400038-68-8 C19H19N3O2
N-ForMyl Oxcarbazepine N-ForMyl Oxcarbazepine 1346601-76-0 C16H12N2O3
OseltaMivir Acid Methyl Ester OseltaMivir Acid Methyl Ester 208720-71-2 C15H26N2O4
2'-[(1E)-2-[4-[[(2-carboxyethyl)aMino]carbonyl]phenyl]diazenyl] Balsalazide 2'-[(1E)-2-[4-[[(2-carboxyethyl)aMino]carbonyl]phenyl]diazenyl] Balsalazide 1346606-53-8 C27H24N6O9
7β-Fulvestrant 7β-Fulvestrant 407577-53-1 C32H47F5O3S
1,3-Di-HABA KanaMycin A 1,3-Di-HABA KanaMycin A 927821-99-6 C26H50N6O15
Dantrolene Related Compound B (50 mg) (5-(4-nitrophenyl)-2-furaldehyde-(2-carboxymethyl) semicarbazone) Dantrolene Related Compound B (50 mg) (5-(4-nitrophenyl)-2-furaldehyde-(2-carboxymethyl) semicarbazone) 57268-33-4 C14H12N4O6
Doxazosin Related Compound F (15 mg) (N,N'-bis(1,4-benzodioxane-2-carbonyl)piperazine) Doxazosin Related Compound F (15 mg) (N,N'-bis(1,4-benzodioxane-2-carbonyl)piperazine) 617677-53-9 C22H22N2O6
7-Methoxy-4-oxo-1,4-dihydroquinoline-6-carboxylic acid 7-Methoxy-4-oxo-1,4-dihydroquinoline-6-carboxylic acid 417721-34-7 C11H9NO4
Pemetrexed Pemetrexed
Venlafaxine Venlafaxine C17H27NO2
(S)-4,5-dichloro-N-((2-oxo-3-(4-(3-oxoMorpholino)phenyl)oxazolidin-5-yl)Methyl)thiophene-2-carboxaMide (S)-4,5-dichloro-N-((2-oxo-3-(4-(3-oxoMorpholino)phenyl)oxazolidin-5-yl)Methyl)thiophene-2-carboxaMide 1770812-37-7 C19H17Cl2N3O5S
2-Propen-1-one, 1-[4-[4-aMino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyriMidin-1-yl]-1-piperidinyl]- 2-Propen-1-one, 1-[4-[4-aMino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyriMidin-1-yl]-1-piperidinyl]- 936563-92-7 C25H24N6O2
8-cyclopentyl-5-Methyl-2-((5-(piperazin-1-yl)pyridin-2-yl)aMino)-6-vinylpyrido[2,3-d]pyriMidin-7(8H)-one 8-cyclopentyl-5-Methyl-2-((5-(piperazin-1-yl)pyridin-2-yl)aMino)-6-vinylpyrido[2,3-d]pyriMidin-7(8H)-one C24H29N7O
D-Alanine, N-[[P(R),2'R]-2'-deoxy-2'-fluoro-2'-Methyl-P-phenyl-5'-uridylyl]-, 1-Methylethyl ester D-Alanine, N-[[P(R),2'R]-2'-deoxy-2'-fluoro-2'-Methyl-P-phenyl-5'-uridylyl]-, 1-Methylethyl ester 1496552-16-9 C22H29FN3O9P
D-Phenylalanine, N-[(1,1-diMethylethoxy)carbonyl]-L-leucyl-, Methyl ester D-Phenylalanine, N-[(1,1-diMethylethoxy)carbonyl]-L-leucyl-, Methyl ester 15136-32-0 C21H32N2O5
4-Nitro-2-phenoxyphenol 4-Nitro-2-phenoxyphenol 70995-08-3 C12H9NO4
Sofosbuvir Impurity Sofosbuvir Impurity 1233335-82-4 C16H25FN3O9P
Ethyl 3,4-O-isopropylideneshikiMate Ethyl 3,4-O-isopropylideneshikiMate 136994-78-0 C12H18O5
4-Vinyl-piperidine-4-carboxylic acid ethyl ester 4-Vinyl-piperidine-4-carboxylic acid ethyl ester 1509910-91-1 C10H17NO2
(2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-aMino-2-Methylpentanoic acid (2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-aMino-2-Methylpentanoic acid 1039307-95-3 C18H21NO2
EMpagliflozin iMpurity 16 EMpagliflozin iMpurity 16
((R)-2-biphenyl-4-yl-1-forMylethyl)carbaMic acid t-butyl ester ((R)-2-biphenyl-4-yl-1-forMylethyl)carbaMic acid t-butyl ester 149709-58-0 C20H23NO3
1-(2,3-DiMethylphenyl)-1-(1H-iMidazol-4-yl)ethanol 1-(2,3-DiMethylphenyl)-1-(1H-iMidazol-4-yl)ethanol 86347-12-8 C13H16N2O
Ropivacaine-iPr-R Ropivacaine-iPr-R 1050482-18-2 C17H26N2O
Demiditraz IMpurity Demiditraz IMpurity 944268-66-0 C20H22N2O
AcarBose EP Impurity B AcarBose EP Impurity B 1220983-54-9 C26H43NO17
3-Formyl-25-desacetyl Rifamycin 3-Formyl-25-desacetyl Rifamycin 16783-97-4 C36H45NO12
4-(3-Methylphenyl)-2H-pyrido[4,3-e]-1,2,4-thiadiazin-3(4H)-one 1,1-Dioxide 4-(3-Methylphenyl)-2H-pyrido[4,3-e]-1,2,4-thiadiazin-3(4H)-one 1,1-Dioxide 72810-61-8 C13H11N3O3S
8-Desacetyl-8-carboxy Daunorubicin Hydrochloride 8-Desacetyl-8-carboxy Daunorubicin Hydrochloride 58199-96-5 C26H27NO11.ClH
D,L N,O-Didesmethylvenlafaxine D,L N,O-Didesmethylvenlafaxine 135308-74-6 C15H23NO2
Desmethyl Erlotinib Acetate Desmethyl Erlotinib Acetate 183320-15-2 C23H23N3O5
Erythromycin E_x000b_Discontinued Erythromycin E_x000b_Discontinued 41451-91-6 C37H65NO14
2-(3,4-dihydroxyphenyl)acetaldehyde 2-(3,4-dihydroxyphenyl)acetaldehyde 5707-55-1 C8H8O3
NSC 77154 NSC 77154 4121-39-5 C8H9N5
N-Methyl-N,N-bis(2-pyridylethyl)amine N-Methyl-N,N-bis(2-pyridylethyl)amine 5452-87-9 C15H19N3
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