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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Meropenem impurity diastereomer 2 Meropenem impurity diastereomer 2 96035-15-3 C15H19N3O5S
Clindamycin Impurity A Clindamycin Impurity A
Tigecycline Impurity F Tigecycline Impurity F
Fasudil iMpurity A Fasudil iMpurity A
Cefminox Impurity C Cefminox Impurity C
Cefazoline Impurity A Cefazoline Impurity A
Rifaximin impurity A Rifaximin impurity A
4,5,6,7-Tetrahydro-thieno[3,2-c]pyridin-2-ol 2-acetate 4,5,6,7-Tetrahydro-thieno[3,2-c]pyridin-2-ol 2-acetate 1151904-85-6 C9H11NO2S
ethyl (R)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate ethyl (R)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate 110548-06-6 C15H13F2NO4
methyl (Z)-3-(((4-(2-(4-(2-((4-((((Z)-6-(methoxymethyl)-2-oxoindolin-3-ylidene)(phenyl)methyl)amino)phenyl)(methyl)amino)-2-oxoethyl)piperazin-1-yl)-N-methylacetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate methyl (Z)-3-(((4-(2-(4-(2-((4-((((Z)-6-(methoxymethyl)-2-oxoindolin-3-ylidene)(phenyl)methyl)amino)phenyl)(methyl)amino)-2-oxoethyl)piperazin-1-yl)-N-methylacetamido)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate 2097505-01-4 C56H54N8O7
Roxithromycin EP Impurity J Roxithromycin EP Impurity J 134834-12-1 C40H73ClN2O14
Venlafaxine D6 Venlafaxine D6 940297-06-3 C17H27NO2
Levosimendan Impurity 3 Levosimendan Impurity 3
Sofosbuvir Impurity29 Sofosbuvir Impurity29
Acarbose Impurity A Acarbose Impurity A
Levosimendan Impurity 1 Levosimendan Impurity 1 1643439-59-1 C22H23N7O2
Atomoxetine EP Impurity F Atomoxetine EP Impurity F
Quetiapine EP Impurity Q Quetiapine EP Impurity Q
Cefoxitin Impurity Cefoxitin Impurity
Acemetacin Impurity Acemetacin Impurity
ethyl (S)-6,7,8-trifluoro-1-(1-hydroxypropan-2-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylate ethyl (S)-6,7,8-trifluoro-1-(1-hydroxypropan-2-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylate 110548-03-3 C15H14F3NO4
ethyl (E)-2-(2-(4-methoxyphenyl)hydrazono)propanoate ethyl (E)-2-(2-(4-methoxyphenyl)hydrazono)propanoate 4792-57-8 C12H16N2O3
ACT 373898 ACT 373898 1433875-14-9 C15H17BrN4O5S
Reaxys ID: 3623864 Reaxys ID: 3623864 129385-61-1 C17H10ClNO3
Olaparib Impurity D Olaparib Impurity D
1-methylpyrrolidin-3-yl 2-(cyclopentyloxy)-2-phenylacetate 1-methylpyrrolidin-3-yl 2-(cyclopentyloxy)-2-phenylacetate C18H25NO3
Cabozantinib impurity A Cabozantinib impurity A
Loratadine Impurity 2 Loratadine Impurity 2 C22H23ClN2O2
Metoprolol Impurity 1 Metoprolol Impurity 1 C15H25NO3
Pitavastatin Impurity 1 Pitavastatin Impurity 1
Trifluridine Impurity 3 Trifluridine Impurity 3
Vonoprazan Impurity 1 Vonoprazan Impurity 1
Vonoprazan Impurity 4 Vonoprazan Impurity 4
Cinacalcet impurity K Cinacalcet impurity K
Valsartan Impurity 13 Valsartan Impurity 13 C24H29N5O3
Valsartan Impurity 27 Valsartan Impurity 27 C24H29N5O3
Etoricoxib Impurity 6 Etoricoxib Impurity 6
Ezetimibe impurity 3 Ezetimibe impurity 3
Apremilast Impurity C Apremilast Impurity C
bis(1-benzylpiperidin-3-yl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate bis(1-benzylpiperidin-3-yl) 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 166808-97-5 C16H16N2O6
Ticagrelor Imp.J Ticagrelor Imp.J 2248538-63-6 C14H20ClN5O4S
Vortioxetine Imp.E Vortioxetine Imp.E 508233-77-0 C18H22N2S
(3R,4S)-1-(4-fluorophenyl)-3-((S)-3-hydroxy-3-(p-tolyl)propyl)-4-(4-hydroxyphenyl)azetidin-2-one (3R,4S)-1-(4-fluorophenyl)-3-((S)-3-hydroxy-3-(p-tolyl)propyl)-4-(4-hydroxyphenyl)azetidin-2-one 1700622-07-6 C25H24FNO3
Topiroxostat Impurity 1 Topiroxostat Impurity 1
Oxcarbazepine Impurity3 Oxcarbazepine Impurity3
Mosapride IMP Mosapride IMP
4-Ethoxy Paroxetine 4-Ethoxy Paroxetine 606968-04-1 C21H25NO4
Methylene-Bis Paroxetine Methylene-Bis Paroxetine 1292846-10-6 C39H40F2N2O6
Trelagliptin Impurity X Trelagliptin Impurity X 1938080-44-4 C18H22FN5O3
Afatinib Impurity 19 Afatinib Impurity 19 1245555-42-3 C21H21ClFN5O2
Cefoxitin Sodium impurity Cefoxitin Sodium impurity
(1S,2S,3S)-Aprepitant (1S,2S,3S)-Aprepitant 1242175-40-1 C23H21F7N4O3
2-{[(methoxycarbonylmethyl)(toluene-4-sulfonyl)amino]methyl}-4-phenoxybenzoic acid methyl ester 2-{[(methoxycarbonylmethyl)(toluene-4-sulfonyl)amino]methyl}-4-phenoxybenzoic acid methyl ester 1455091-06-1 C25H25NO7S
2-Desisopropyl-2-phenyl Repaglinide 2-Desisopropyl-2-phenyl Repaglinide 107362-12-9 C30H34N2O4
2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 114444-10-9 C14H9ClN2O
BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] 55453-89-9 C16H14O5
Ipragliflozin Impurity 5 Ipragliflozin Impurity 5
Alectinib Impurity Alectinib Impurity 1256584-83-4 C26H25N3O2
Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib 2223677-58-3 C22H20ClFN4O4
Ibrutinib Impurity 18 Ibrutinib Impurity 18 1881246-01-0 C16H12N4O
Vitamin B1 Impurity 6 Vitamin B1 Impurity 6 C12H17ClN4OS
5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) 5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) C20H27NO6
2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2316733-82-9 C14H12F2O2
nicergoline impurity N nicergoline impurity N
Clopidogrel Impurity 50 Clopidogrel Impurity 50 C15H14ClNO2S
PraMipexole IMpurity Z1/Z2 PraMipexole IMpurity Z1/Z2
trans-Ibuprofen Impurity G trans-Ibuprofen Impurity G C13H18O2
Vonoprazan Impurity 15 Vonoprazan Impurity 15
Esomeprazole Impurity 6 Esomeprazole Impurity 6
Erlotinib Impurity 22 Erlotinib Impurity 22
Teneligliptin Impurity 1 Teneligliptin Impurity 1
Erlotinib Hydrochloride iMpurity 51 Erlotinib Hydrochloride iMpurity 51
(S)-10-(1-aminocyclopropyl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid formic acid (S)-10-(1-aminocyclopropyl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid formic acid C17H18N2O6
1H-Imidazole-1-ethanol, α-(chloromethyl)-5-nitro- 1H-Imidazole-1-ethanol, α-(chloromethyl)-5-nitro- 116989-52-7 C6H8ClN3O3
4-Pyridinemethanol, 3-hydroxy-2,5-dimethyl-, hydrochloride (1:1) 4-Pyridinemethanol, 3-hydroxy-2,5-dimethyl-, hydrochloride (1:1) 875-26-3 C8H11NO2.ClH
Afatinib ImpurityOYQ Afatinib ImpurityOYQ
Androst-3-en-17-one,(5) Androst-3-en-17-one,(5) 14935-81-0 C19H28O
Landiolol impurity X Landiolol impurity X
2-((4-(3-aminopiperidin-1-yl) 2-((4-(3-aminopiperidin-1-yl)
Rosuvastatin Impurity 111 Rosuvastatin Impurity 111
Metoprolol IMpurity V Metoprolol IMpurity V C15H25NO3
Teneligliptin Impurity 12 Teneligliptin Impurity 12
Nicergoline EP Impurity E Nicergoline EP Impurity E
Hexanoic acid, 3-[(hydroxyamino)methyl]-5-methyl-, (3S)- Hexanoic acid, 3-[(hydroxyamino)methyl]-5-methyl-, (3S)- 2349671-57-2 C8H17NO3
α-D-Glucopyranoside, methyl 1-C-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-, 2,3,4,6-tetraacetate α-D-Glucopyranoside, methyl 1-C-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-, 2,3,4,6-tetraacetate 714269-58-6 C30H35ClO11
Caspofungin Impurity H Caspofungin Impurity H
(trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine hydrochloride (trans)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)-1-methylpiperidine hydrochloride 127017-41-8 C21H26ClNO4
Ezetimibe Impurity 76 Ezetimibe Impurity 76 1185883-46-8 C39H44F2N2O5Si
Cefmetazole impurity 9/(6R-cis)-7-[[[(Cyanomethyl)thio]acetyl]amino]-3-(hydroxymethyl)-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid Cefmetazole impurity 9/(6R-cis)-7-[[[(Cyanomethyl)thio]acetyl]amino]-3-(hydroxymethyl)-7-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid 70953-19-4 C13H15N3O6S2
((cis)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate ((cis)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methyl 4-methylbenzenesulfonate C20H24FNO3S
Elagolix Sodium impurity1 Elagolix Sodium impurity1
Ibrutinib Impurity 37 Ibrutinib Impurity 37 330793-49-2 C10H13IN6
(S)-((6-(propylamino)-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)amino)methanol (S)-((6-(propylamino)-4,5,6,7-tetrahydrobenzo[d]thiazol-2-yl)amino)methanol C11H19N3OS
(trans)-4-((6-amino-2,3-dibromobenzyl)amino)cyclohexanol (trans)-4-((6-amino-2,3-dibromobenzyl)amino)cyclohexanol C13H18Br2N2O
ERYTHROMYCIN IMPURITY N ERYTHROMYCIN IMPURITY N
Fesoterodine Impurity 12 Fesoterodine Impurity 12
Dexamethasone EP impurities D Dexamethasone EP impurities D
Palbociclib impurity LMAP Palbociclib impurity LMAP
(3R,3'R)-3,3'-((((S)-1-amino-1-oxobutan-2-yl)azanediyl)bis(methylene))dihexanoic acid (3R,3'R)-3,3'-((((S)-1-amino-1-oxobutan-2-yl)azanediyl)bis(methylene))dihexanoic acid C18H34N2O5
Acetaminophen EP Impurity L Acetaminophen EP Impurity L C8H9NO2
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