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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Aztreonam Amide Aztreonam Amide 1219444-93-5 C13H20N6O8S2
N'-[(2Z)-Piperazin-2-ylidene]trifluoroacetohydrazide N'-[(2Z)-Piperazin-2-ylidene]trifluoroacetohydrazide 763105-70-0 C6H9F3N4O
Meropenem Impurity MAP-B Meropenem Impurity MAP-B
(S,E)-N-(4-((3-chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-hydroxybut-2-enamide (S,E)-N-(4-((3-chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-hydroxybut-2-enamide
5-Methoxy-2-Hydroxy Benzimidazole 5-Methoxy-2-Hydroxy Benzimidazole 208-75-3 C13H9N
SODIUM CAMPTOTHECIN SODIUM CAMPTOTHECIN 25387-67-1 C20H17N2NaO5
(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-L-cysteine (5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-L-cysteine 2238849-52-8 C13H15N3O3S
1,1-BIS-(4-ISOBUTYLPHENYL)ETHANE 1,1-BIS-(4-ISOBUTYLPHENYL)ETHANE 102120-87-6 C22H30
N-(2,4-dimethylphenyl)piperidine-2-carboxamide N-(2,4-dimethylphenyl)piperidine-2-carboxamide 99552-32-6 C14H20N2O
BROMOSULBACTAM BROMOSULBACTAM 75527-87-6 C8H10BrNO5S
(S)-PYRROLIDINE-2-CARBONITRILE (S)-PYRROLIDINE-2-CARBONITRILE 204387-53-1 C5H8N2
1-(CHLOROACETYL)-L-PROLINE METHYL ESTER 1-(CHLOROACETYL)-L-PROLINE METHYL ESTER 38074-72-5 C8H12ClNO3
1-(4-PIPERIDINYLCARBONYL)-4-PIPERIDINECARBOXYLIC ACID 1-(4-PIPERIDINYLCARBONYL)-4-PIPERIDINECARBOXYLIC ACID 96053-48-4 C12H20N2O3
1-(3-PYRIDYL)ETHAN-1-ONE OXIME 1-(3-PYRIDYL)ETHAN-1-ONE OXIME 5973-83-1 C7H8N2O
1-(3,4,5-Trimethoxy-benzyl)-piperazinedihydrochloride 1-(3,4,5-Trimethoxy-benzyl)-piperazinedihydrochloride 107049-57-0 C14H24Cl2N2O3
Sitagliptin N-Sulfate Sitagliptin N-Sulfate 940002-57-3 C16H15F6N5O4S
1-Oxo Mirtazapine (Mirtazapine Impurity C) 1-Oxo Mirtazapine (Mirtazapine Impurity C) 191546-96-0 C17H17N3O
N-(2,6-Dimethylphenyl)-2-(ethylmethylamino)acetamide Hydrochloride_x000b_(Lidocaine Impurity E) N-(2,6-Dimethylphenyl)-2-(ethylmethylamino)acetamide Hydrochloride_x000b_(Lidocaine Impurity E) 50295-20-0 C13H21ClN2O
ent-Cinacalcet Hydrochloride ent-Cinacalcet Hydrochloride 694495-47-1 C22H22F3N
Nsc529487 Nsc529487 3310-47-2 C9H13N3O6
Oxathiolan 5fu-.B. Oxathiolan 5fu-.B. 145986-11-4 C8H9FN2O4S
Decarboxy Enrofloxacin Decarboxy Enrofloxacin 131775-99-0 C18H22FN3O
Desethanol Dipyridamole Desethanol Dipyridamole 1176886-12-6 C22H36N8O3
2’’-Desethyl-2’’-vinyl Simvastatin 2’’-Desethyl-2’’-vinyl Simvastatin 1449248-72-9 C25H36O5
1,2-Dihydro Dexamethasone 1,2-Dihydro Dexamethasone 426-17-5 C22H31FO5
Lamotrigine N2-Oxide Lamotrigine N2-Oxide 136565-76-9 C9H7Cl2N5O
4-[3-(Methylamino)-1-(2-thienyl)propyl]- 4-[3-(Methylamino)-1-(2-thienyl)propyl]- 949096-01-9 C18H20BrNOS
N-Isopropyl Carvedilol N-Isopropyl Carvedilol 1246819-01-1 C27H32N2O4
5-Oxo Atorvastatin 5-Oxo Atorvastatin 1391052-82-6 C33H33FN2O5
1-Methyl-12-thioxopyrido[1,2,3,4]imidazole-[1,2-a]benzimidazole-2(12H)-one 1-Methyl-12-thioxopyrido[1,2,3,4]imidazole-[1,2-a]benzimidazole-2(12H)-one 1246819-06-6 C14H9N3OS
Quetiapine Hydroxy Impurity Quetiapine Hydroxy Impurity 329216-67-3 C19H21N3OS
7-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene (Raloxifene Impurity) 7-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene (Raloxifene Impurity) 1159977-58-8 C42H44N2O6S
rac N-Demethyl Promethazine Hydrochloride rac N-Demethyl Promethazine Hydrochloride 60113-77-1 C16H19ClN2S
Lincomycin B Hydrochloride Lincomycin B Hydrochloride 11021-35-5 C17H33ClN2O6S
Flucloxacillin impurity C Flucloxacillin impurity C
1-[2-amino-1-(4-hydroxyphenyl)ethyl]cyclohexanol 1-[2-amino-1-(4-hydroxyphenyl)ethyl]cyclohexanol 149289-29-2 C14H21NO2
(2E)-3-(Dimethylamino)-1-(3-pyridyl)prop-2-en-1-one (2E)-3-(Dimethylamino)-1-(3-pyridyl)prop-2-en-1-one 123367-26-0 C10H12N2O
5-(2R)-2-Oxiranyl-8-benzyloxy-2(1H)-quinolinone 5-(2R)-2-Oxiranyl-8-benzyloxy-2(1H)-quinolinone 173140-90-4 C18H15NO3
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
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
Verapamil Related Compound A (50 mg) (3,4-Dimethoxy-alpha-[3-(methylamino)propyl]-alpha-(1-methylethyl)-benzeneacetonitrile monohydrochloride) Verapamil Related Compound A (50 mg) (3,4-Dimethoxy-alpha-[3-(methylamino)propyl]-alpha-(1-methylethyl)-benzeneacetonitrile monohydrochloride) 67775-97-7 C17H27ClN2O2
Ethanediamide, N1-(5-chloro-2-pyridinyl)-N2-[(1R,2S,4R)-4-[(dimethylamino)carbonyl]-2-[[(4,5,6,7-tetrahydro-5-methylthiazolo[5,4-c]pyridin-2-yl)carbonyl]amino]cyclohexyl]- Ethanediamide, N1-(5-chloro-2-pyridinyl)-N2-[(1R,2S,4R)-4-[(dimethylamino)carbonyl]-2-[[(4,5,6,7-tetrahydro-5-methylthiazolo[5,4-c]pyridin-2-yl)carbonyl]amino]cyclohexyl]- 1255529-23-7 C24H30ClN7O4S
Palonosetron Palonosetron 135729-56-5 C19H22N2O
EthanediaMide, N1-(5-chloro-2-pyridinyl)-N2-[(1R,2S,4S)-4-[(diMethylaMino)carbonyl]-2-[[(4,5,6,7-tetrahydro-5-Methylthiazolo[5,4-c]pyridin-2-yl)carbonyl]aMino]cyclohexyl]- EthanediaMide, N1-(5-chloro-2-pyridinyl)-N2-[(1R,2S,4S)-4-[(diMethylaMino)carbonyl]-2-[[(4,5,6,7-tetrahydro-5-Methylthiazolo[5,4-c]pyridin-2-yl)carbonyl]aMino]cyclohexyl]- 1255529-25-9 C24H30ClN7O4S
N-((3R,4R)-1-benzyl-4-Methylpiperidin-3-yl)-2-chloro-N-Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-aMine N-((3R,4R)-1-benzyl-4-Methylpiperidin-3-yl)-2-chloro-N-Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-aMine 923036-25-3 C20H24ClN5
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 117811-20-8 C19H17ClN2
Fludarabine Phosphate iMpurity B Fludarabine Phosphate iMpurity B 149297-79-0 C5H5N5O
nifedipine iMpurity C nifedipine iMpurity C 111304-31-5 C12H11NO5
RofluMilast related substance RofluMilast related substance 475271-62-6 C16H14Cl2N2O3
Ritonavir EP Impurity I Ritonavir EP Impurity I 165315-26-4 C36H46N6O5S2
(6R-trans)-7-[(2,2-diMethyl-1-oxopropyl)aMino]-3-Methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2- (6R-trans)-7-[(2,2-diMethyl-1-oxopropyl)aMino]-3-Methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2- 146794-70-9 C13H18N2O4S
3-[3-[[[(7S)-3,4-DiMethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl]Methyl]MethylaMino]propyl]-1,3-dihydro-7,8-diMethoxy-H-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-dihydro-7,8-diMethoxy-H-3-benzazepin-2-one 1086026-31-4 C27H34N2O5
7-[(3R)-3-[(N-Acetyl)AMino]-1-oxo-4-(2,4,5-trifluorophenyl)butyl]-5,6,7,8-tetrahydro-3-(trifluoroMethyl)-1,2,4-triazolo[4,3-a]pyrazine 7-[(3R)-3-[(N-Acetyl)AMino]-1-oxo-4-(2,4,5-trifluorophenyl)butyl]-5,6,7,8-tetrahydro-3-(trifluoroMethyl)-1,2,4-triazolo[4,3-a]pyrazine 1379666-94-0 C18H17F6N5O2
2-[[Methyl[(3S)-3-(1-naphthalenyloxy)-3-(2-thienyl)propyl]aMino]carbonyl]benzoic Acid 2-[[Methyl[(3S)-3-(1-naphthalenyloxy)-3-(2-thienyl)propyl]aMino]carbonyl]benzoic Acid 199191-67-8 C26H23NO4S
Labetalol IMpurity B Labetalol IMpurity B 802620-01-5 C20H25NO4
Ritonavir EP Impurity C Ritonavir EP Impurity C 1010808-43-1 C25H29N3O4S
AcetaMide, N,N-bis[2-(7-Methoxy-1-naphthalenyl)ethyl]- AcetaMide, N,N-bis[2-(7-Methoxy-1-naphthalenyl)ethyl]- 1385018-58-5 C28H29NO3
(S)-quinuclidin-3-aMine (S)-quinuclidin-3-aMine 120570-05-0 C7H14N2
Benzene, 1-chloro-2-nitroso- Benzene, 1-chloro-2-nitroso- 932-33-2 C6H4ClNO
IMp. A (EP): Ethyl 4-[(11RS)-8-Chloro-11-hydroxy-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-yl]piperidine-1-carboxylate IMp. A (EP): Ethyl 4-[(11RS)-8-Chloro-11-hydroxy-6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-yl]piperidine-1-carboxylate 38092-95-4 C19H20N2
PeMetrexed EP IMpurity E PeMetrexed EP IMpurity E 182009-04-7 C20H21N5O6
Itraconazole iMpurity A Itraconazole iMpurity A
(S)-BoroLeu-(-)-Pinanediol-CF3COOH (S)-BoroLeu-(-)-Pinanediol-CF3COOH 477254-69-6 C17H29BF3NO4
Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, MonoMethyl ester Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, MonoMethyl ester 3333-46-8 C5H8O6
Valsartan D9 Valsartan D9 1089736-73-1 C24H29N5O3
N-((3S,4S)-1-benzyl-4-Methylpiperidin-3-yl)-N-Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-aMine N-((3S,4S)-1-benzyl-4-Methylpiperidin-3-yl)-N-Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-aMine 1252883-90-1 C20H25N5
P219490 P219490 937370-10-0 C20H21N5Na2O6**
(S)-4-(TERT-BUTOXY)-2-ISOPROPYL-4-OXOBUTANOIC ACID (S)-4-(TERT-BUTOXY)-2-ISOPROPYL-4-OXOBUTANOIC ACID 134807-43-5 C11H20O4
Acarbose D-Fructose IMpurity Acarbose D-Fructose IMpurity 1013621-79-8 C25H43NO18
2,4,6,8-Tetraoxa-5-phosphanonanedioic acid, 5-[[(1R)-2-(6-aMino-9H-purin-9-yl)-1-Methylethoxy]Methyl]-, 1-ethyl 9-(1-Methylethyl) ester, 5-oxide 2,4,6,8-Tetraoxa-5-phosphanonanedioic acid, 5-[[(1R)-2-(6-aMino-9H-purin-9-yl)-1-Methylethoxy]Methyl]-, 1-ethyl 9-(1-Methylethyl) ester, 5-oxide 1422284-16-9 C18H28N5O10P
(R)-α-[2-(1-naphthalenyloxy)ethyl]-benzeneMethanol (R)-α-[2-(1-naphthalenyloxy)ethyl]-benzeneMethanol 156453-53-1 C19H18O2
(1S,2S,3R,5S)-3-(7-((1S,2R)-2-(3,4-difluorophenyl)cyclopropylaMino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol (1S,2S,3R,5S)-3-(7-((1S,2R)-2-(3,4-difluorophenyl)cyclopropylaMino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol 2096989-56-7 C23H28F2N6O4S
Fosaprepitant iMpurity Fosaprepitant iMpurity
Apixaban iMpurity 1 Apixaban iMpurity 1
Azilsartan iMpurity H Azilsartan iMpurity H
Azilsartan iMpurity M Azilsartan iMpurity M
bortezoMib iMpurity F bortezoMib iMpurity F
cefoxitin iMpurity A cefoxitin iMpurity A
3-Morpholinone, 4-(2-aMinophenyl)- 3-Morpholinone, 4-(2-aMinophenyl)- 1082588-73-5 C10H12N2O2
(R)-N-(1-(naphthalen-1-yl)ethyl)-3-(4-(trifluoroMethyl)phenyl)propan-1-aMine (R)-N-(1-(naphthalen-1-yl)ethyl)-3-(4-(trifluoroMethyl)phenyl)propan-1-aMine 1428185-71-0 C22H22F3N
1-Piperidinepropanenitrile, 4-Methyl-3-(Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-ylaMino)-β-oxo- 1-Piperidinepropanenitrile, 4-Methyl-3-(Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-ylaMino)-β-oxo- 344418-92-4 C16H20N6O
Erlotinib impurity A Erlotinib impurity A 183321-85-9 C21H20ClN3O3
1,3-Dioxane-4,6-dione, 5-[[(3,4-diMethoxyphenyl)aMino]Methylene]-2,2-diMethyl- 1,3-Dioxane-4,6-dione, 5-[[(3,4-diMethoxyphenyl)aMino]Methylene]-2,2-diMethyl- 213699-53-7 C15H17NO6
(2R,3R)-2-[(1S)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(4-fluorophenyl)Morpholine hydrochloride (2R,3R)-2-[(1S)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(4-fluorophenyl)Morpholine hydrochloride 1333998-21-2 C20H19ClF7NO2
Budesonide iMpurity Budesonide iMpurity 192057-49-1 C24H32O6
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