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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Ceftazidime EP Impurity D Ceftazidime EP Impurity D 73547-69-0 C45H44N6O7S2
Nicergoline EP Impurity G Nicergoline EP Impurity G 57935-65-6 C23H24BrN3O2
Benzenesulfonamide, 4-[5-(4-methylphenyl)-2-oxido-3-(trifluoromethyl)-1H-pyrazol-1-yl]- Benzenesulfonamide, 4-[5-(4-methylphenyl)-2-oxido-3-(trifluoromethyl)-1H-pyrazol-1-yl]- 2356153-95-0 C17H14F3N3O3S
2-Pyrrolidinecarbonitrile, 1-(2-aminoacetyl)-, hydrochloride (1:1), (2S)- 2-Pyrrolidinecarbonitrile, 1-(2-aminoacetyl)-, hydrochloride (1:1), (2S)- 913980-23-1 C7H12ClN3O
Lamivudine Impurity 7 Lamivudine Impurity 7 147126-63-4 C14H24O4S
EsCitalopram EP Impurity I EsCitalopram EP Impurity I 1370643-22-3 C20H21FN2O
(trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine (trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine 127017-42-9 C21H25NO4
Methylprednisolone Impurity 21 Methylprednisolone Impurity 21 150899-33-5 C22H28O4
Epinephrine Impurity 7 Epinephrine Impurity 7 62322-82-1 C9H11NO3
(trans)-4-((2-amino-4,6-dibromobenzyl)amino)cyclohexanol (trans)-4-((2-amino-4,6-dibromobenzyl)amino)cyclohexanol C13H18Br2N2O
Fesoterodine Impurity 14 Fesoterodine Impurity 14
Dexamethasone EP impurities E Dexamethasone EP impurities E
(R)-N-((S)-2-aminobutanoyl)-3-(bromomethyl)hexanamide (R)-N-((S)-2-aminobutanoyl)-3-(bromomethyl)hexanamide C11H21BrN2O2
Empagliflozin Impurity 57（R,R） Empagliflozin Impurity 57（R,R）
Azacitidine Impurity 37 Azacitidine Impurity 37 206269-46-7 C8H12N4O5
Aripiprazole peroxide degradation Impurity (MW:303Da) Aripiprazole peroxide degradation Impurity (MW:303Da)
NA NA
2,2'-(4,10-bis((trans)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid Gd3+ 2,2'-(4,10-bis((trans)-1,3,4-trihydroxybutan-2-yl)-1,4,7,10-tetraazacyclododecane-1,7-diyl)diacetic acid Gd3+
N-[3-[3-(1-Piperidinylmethyl)phenoxy]propyl]amine N-[3-[3-(1-Piperidinylmethyl)phenoxy]propyl]amine 73278-98-5 C15H24N2O
AlviMopan iMpurity AlviMopan iMpurity
Caspofungin iMpurity Caspofungin iMpurity
Saxagliptin iMpurity Saxagliptin iMpurity 2173146-35-3 C18H24ClN3O2
PD 312237 PD 312237 501666-23-5 C20H35NO11
(1R,5S,6S)-rel-5-(1-Ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Methyl Ester (1R,5S,6S)-rel-5-(1-Ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Methyl Ester 1234858-94-6 C13H20O4
AlMotriptan Related CoMpound B AlMotriptan Related CoMpound B 1246860-65-0 C19H25N3O6S
Benazepril Related CoMpound B Benazepril Related CoMpound B
IMatinib iMpurity IMatinib iMpurity 152459-96-6 C24H21N5O
(2R,3R,4R,5S,6R)-2-(acetoxyMethyl)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)Methyl)-4-Methylphenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate (2R,3R,4R,5S,6R)-2-(acetoxyMethyl)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)Methyl)-4-Methylphenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate C32H33FO9S
1,2-BenzenedicarboxaMide, N1,N2-bis[[(5S)-2-oxo-3-[4-(3-oxo-4-Morpholinyl)phenyl]-5-oxazolidinyl]Methyl]- 1,2-BenzenedicarboxaMide, N1,N2-bis[[(5S)-2-oxo-3-[4-(3-oxo-4-Morpholinyl)phenyl]-5-oxazolidinyl]Methyl]- 1365267-36-2 C36H36N6O10
2-QuinazolineMethanol, 4-Methyl- 2-QuinazolineMethanol, 4-Methyl- 13535-91-6 C10H10N2O
5-(2,2-diMethyl-4H-benzo[d][1,3]dioxin-6-yl)oxazolidin-2-one 5-(2,2-diMethyl-4H-benzo[d][1,3]dioxin-6-yl)oxazolidin-2-one 452340-96-4 C13H15NO4
(+/-)-tert-Butyl 6-Chloro-5-hydroxy-3-oxohexanoate (+/-)-tert-Butyl 6-Chloro-5-hydroxy-3-oxohexanoate 319924-73-7 C10H17ClO4
(R)-2-(2-aminothiazol-4-yl)-N-(2-(2-((2-hydroxy-2-phenylethyl)amino)ethyl)phenyl)acetamide (R)-2-(2-aminothiazol-4-yl)-N-(2-(2-((2-hydroxy-2-phenylethyl)amino)ethyl)phenyl)acetamide 1684452-80-9 C21H24N4O2S
1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic Acid 3-[2-[(3,3-Diphenylpropyl)methylamino]-1,1-dimethylethyl] 5-ethyl Ester Hydrochloride 1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic Acid 3-[2-[(3,3-Diphenylpropyl)methylamino]-1,1-dimethylethyl] 5-ethyl Ester Hydrochloride 210579-71-8 C37H44ClN3O6
2-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbaldehyde 2-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbaldehyde 2169267-53-0 C11H7ClFNO
4-(4-(4-(4-(((3S,5S)-5-((1H-1,2,4-triazol-1-yl)methyl)-5-(2,4-difluorophenyl)tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-1-((2R,3S)-2-hydroxypentan-3-yl)-1H-1,2,4-triazol-5(4H)-one 4-(4-(4-(4-(((3S,5S)-5-((1H-1,2,4-triazol-1-yl)methyl)-5-(2,4-difluorophenyl)tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-1-((2R,3S)-2-hydroxypentan-3-yl)-1H-1,2,4-triazol-5(4H)-one 2243785-99-9 C37H42F2N8O4
5-(2-fluorophenyl)-N-methyl-1-(pyridin-3-ylsulfonyl)-1H-pyrrole-3-carboxamide 5-(2-fluorophenyl)-N-methyl-1-(pyridin-3-ylsulfonyl)-1H-pyrrole-3-carboxamide 2054536-04-6 C17H14FN3O3S
Ozagrel Impurity 10 Ozagrel Impurity 10
tris((5-(2-fluorophenyl)-1H-pyrrol-3-yl)methyl)amine tris((5-(2-fluorophenyl)-1H-pyrrol-3-yl)methyl)amine C33H27F3N4
Esmolol impurity C Esmolol impurity C
3-[4-(acetyloxymethyl)phenyl]-2-propenoic acid methyl ester 3-[4-(acetyloxymethyl)phenyl]-2-propenoic acid methyl ester 100688-45-7 C13H14O4
Acetaminophen Impurity 14 Acetaminophen Impurity 14 1991204-56-8 C16H18N2O2
Ketoconazole Impurity 7 Ketoconazole Impurity 7 172032-21-2 C11H12Cl2O3
Rosuvastatin Impurity 59 Rosuvastatin Impurity 59
Losartan Impurity 12 Losartan Impurity 12 727718-93-6 C22H22ClN9
benzyl (2S)-2-amino-3-(4-methanesulfonylphenyl)propanoate hydrochloride benzyl (2S)-2-amino-3-(4-methanesulfonylphenyl)propanoate hydrochloride 1865726-28-8 C17H19NO4S
Glycopyrrolate Impurity 12 Glycopyrrolate Impurity 12 857353-41-4 C13H14O3
(4S,4aR,5R,12aS)-4-(dimethylamino)-3,5,10,11,12a-pentahydroxy-6-methyl-1,12-dioxo-1,4,4a,5,12,12a-hexahydrotetracene-2-carboxamide (4S,4aR,5R,12aS)-4-(dimethylamino)-3,5,10,11,12a-pentahydroxy-6-methyl-1,12-dioxo-1,4,4a,5,12,12a-hexahydrotetracene-2-carboxamide 4660-26-8 C22H22N2O8
Regorafenib Impurity 38 Regorafenib Impurity 38
Cefazolin Impurity 28 Cefazolin Impurity 28
NA NA
Acarbose Impurity IV (JP) Acarbose Impurity IV (JP) C13H21NO7
Vonoprazan Impurity 57 Vonoprazan Impurity 57
Tafluprost Impurity 9 Tafluprost Impurity 9 2099033-66-4 C27H41NO8
N1-Losartanyl-losartan (Losartan IMpurity) N1-Losartanyl-losartan (Losartan IMpurity) 230971-71-8 C44H44Cl2N12O
N2-Losartanyl-losartan (Losartan IMpurity) N2-Losartanyl-losartan (Losartan IMpurity) 230971-72-9 C44H44Cl2N12O
N-Ethoxycarbonyl 7-ADCA N-Ethoxycarbonyl 7-ADCA 72820-16-7 C11H14N2O5S
4-PyridinecarboxaMide, N-(2,6-diMethylphenyl)- 4-PyridinecarboxaMide, N-(2,6-diMethylphenyl)- 68280-05-7 C14H14N2O
4-N-Desacetyl-5-N-acetyl OseltaMivir 4-N-Desacetyl-5-N-acetyl OseltaMivir 956267-10-0 C16H28N2O4
rac N-DesMethyl-N-(4-Methoxyphenethyl) Venlafaxine rac N-DesMethyl-N-(4-Methoxyphenethyl) Venlafaxine 1346601-14-6 C25H35NO3
11-Keto Oxcarbazepine 11-Keto Oxcarbazepine 537693-29-1 C15H10N2O3
Isopropyl 4-(3-AMinophenyl)-1,4-dihydro-5-(2-Methoxyethoxycarbonyl)-2,6-diMethylpyridine-3-carboxylate Isopropyl 4-(3-AMinophenyl)-1,4-dihydro-5-(2-Methoxyethoxycarbonyl)-2,6-diMethylpyridine-3-carboxylate 155861-24-8 C21H28N2O5
(E)-Olopatadine (E)-Olopatadine 113806-06-7 C21H23NO3
NeMadipine B NeMadipine B 79925-38-5 C19H21Cl2NO4
N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole 957470-59-6 C24H24F2N4O6S
4-Epi-6-epi Doxycycline 4-Epi-6-epi Doxycycline 97583-08-9 C22H24N2O8
Ethyl 3,4-O-Isopropylidene-5-O-methanesulfonylshikimate Ethyl 3,4-O-Isopropylidene-5-O-methanesulfonylshikimate 204254-84-2 C13H20O7S
2-PyrazinecarboxaMide, N,N',N''-[2,4,6-boroxintriyltris[[(1R)-3-Methylbutylidene]iMino[(1S)-2-oxo-1-(phenylMethyl)-2,1-ethanediyl]]]tris- 2-PyrazinecarboxaMide, N,N',N''-[2,4,6-boroxintriyltris[[(1R)-3-Methylbutylidene]iMino[(1S)-2-oxo-1-(phenylMethyl)-2,1-ethanediyl]]]tris- 390800-88-1 C57H69B3N12O9
D-hydroxyphenylglycylamoxicillin) D-hydroxyphenylglycylamoxicillin) 188112-75-6 C24H26N4O7S
7,10-Bis-O-(2,2,2-trichloroethoxycarbonyl)-10-deacetylbaccatin III 7,10-Bis-O-(2,2,2-trichloroethoxycarbonyl)-10-deacetylbaccatin III 95603-44-4 C35H38Cl6O14
4-(3-AMino-phenyl)-Morpholin-3-one 4-(3-AMino-phenyl)-Morpholin-3-one 1082495-22-4 C10H12N2O2
2-(DiethylaMino)-N-(2,3-diMethylphenyl)acetaMide Hydrochloride 2-(DiethylaMino)-N-(2,3-diMethylphenyl)acetaMide Hydrochloride 857170-72-0 C14H23ClN2O
4-Hydroxy Darunavir 4-Hydroxy Darunavir 313682-97-2 C27H37N3O8S
Deschloroaripiprazole Deschloroaripiprazole 203395-81-7 C23H28ClN3O2
O-[(Guanin-9-yl)Methyl] Acyclovir O-[(Guanin-9-yl)Methyl] Acyclovir 166762-90-9 C14H16N10O4
3-(4-Carboethoxy)phenyl propanal 3-(4-Carboethoxy)phenyl propanal 151864-81-2 C12H14O3
(2,6-Xylyloxy)acetyl Lopinavir (2,6-Xylyloxy)acetyl Lopinavir 943250-65-5 C47H58N4O7
(S)-IsotiMolol (TiMolol IMpurity B) (S)-IsotiMolol (TiMolol IMpurity B) 158636-96-5 C13H24N4O3S
Afatinib IMpurity A Afatinib IMpurity A
Afatinib IMpurity G Afatinib IMpurity G
Articaine IMpurity F (Articaine Acid PropionaMide HCl) Articaine IMpurity F (Articaine Acid PropionaMide HCl)
Avanafil iMpurity 4 Avanafil iMpurity 4 874482-97-0 C8H11Cl2NO
Clopidogrel IMpurity 4 Clopidogrel IMpurity 4 801319-16-4 C15H14ClNO2S
Dehydro Azelnidipine Dehydro Azelnidipine 918659-10-6 C33H32N4O6
DiazepaM IMpurity F DiazepaM IMpurity F 31269-33-7 C16H13ClN2O
LaMotrigine IMpurity LaMotrigine IMpurity
Posaconazole DiastereoisoMer interMediate 5 Posaconazole DiastereoisoMer interMediate 5 149809-42-7 C21H21F2N3O4S
Prasugrel alpha-Hydroxy IMpurity Prasugrel alpha-Hydroxy IMpurity 1100905-45-0 C11H11FO2
Solifenacin Related CoMpound 2 Succinate Solifenacin Related CoMpound 2 Succinate 1262506-09-1 C27H32N2O6
Tetrahydro FuroseMide Tetrahydro FuroseMide 4793-38-8 C12H15ClN2O5S
6-O-DesMethoxyethyl-6-O-chloroethyl Erlotinib Hydrochloride 6-O-DesMethoxyethyl-6-O-chloroethyl Erlotinib Hydrochloride 183320-04-9 C21H21Cl2N3O3
Macitentan IMpurity Macitentan IMpurity 556796-88-4 C17H15Br2N5O4S
4-((4-broMophenyl)(1H-1,2,4-triazol-1-yl)Methyl)benzonitrile 4-((4-broMophenyl)(1H-1,2,4-triazol-1-yl)Methyl)benzonitrile 143030-54-0 C16H11BrN4
Acetic acid, 2-[2-[4-(diphenylMethyl)-1-piperazinyl]ethoxy]- Acetic acid, 2-[2-[4-(diphenylMethyl)-1-piperazinyl]ethoxy]- 83881-53-2 C21H26N2O3
AZITHROMYCIN IMPURITY A AZITHROMYCIN IMPURITY A
Oseltamivir Impurity 94 Oseltamivir Impurity 94
Oseltamivir Impurity 82 Oseltamivir Impurity 82
Oseltamivir Impurity 74 Oseltamivir Impurity 74
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
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