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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Dapagliflozin Impurity 165 Dapagliflozin Impurity 165 342043-51-0 C18H18O4
3'-Desethoxy Drotaverine Hydrochloride 3'-Desethoxy Drotaverine Hydrochloride 85475-87-2 C22H28ClNO4
(S)-dimethyl 2-(4-(4-oxobutyl)benzamido)pentanedioate (S)-dimethyl 2-(4-(4-oxobutyl)benzamido)pentanedioate 1081974-98-2 C18H23NO6
Peramivir Impurity 38 Peramivir Impurity 38
2-O-cinnamoyl-beta-D-glucose 2-O-cinnamoyl-beta-D-glucose
(3S)-3-((S)-1-oxo-3a,4,5,6-tetrahydro-1H-benzo[de]isoquinolin-2(3H)-yl)quinuclidine 1-oxide (3S)-3-((S)-1-oxo-3a,4,5,6-tetrahydro-1H-benzo[de]isoquinolin-2(3H)-yl)quinuclidine 1-oxide
2-(4-hydroxy-1-methyl-7-phenoxy-5,6,7,8-tetrahydroisoquinoline-3-carboxamido)acetic acid 2-(4-hydroxy-1-methyl-7-phenoxy-5,6,7,8-tetrahydroisoquinoline-3-carboxamido)acetic acid
6-HYDROXYLAMINOURACIL 6-HYDROXYLAMINOURACIL 20555-88-8 C4H5N3O2
7-PACE Impurity 1 7-PACE Impurity 1
1-(3-Cyanopyridyl-2)-2-Phenyl-4-Methylpyperazine 1-(3-Cyanopyridyl-2)-2-Phenyl-4-Methylpyperazine 61337-88-0 C17H18N4
Ertapenem Impurity E(USP) Ertapenem Impurity E(USP)
Pyrazinecarboxaldehyde, trimethyl- (9CI) Pyrazinecarboxaldehyde, trimethyl- (9CI) 186534-02-1 C8H10N2O
Acetamide, N-[4-[(2R)-3-cyano-2-methyl-1-oxopropyl]phenyl]- Acetamide, N-[4-[(2R)-3-cyano-2-methyl-1-oxopropyl]phenyl]- 2428573-45-7 C13H14N2O2
4-[6-(2-Chloroethyl)-3,6,7,8-tetrahydro-3-methylimidazo[4,5-h][1,4]benzothiazin-2-yl]butanoic acid 4-[6-(2-Chloroethyl)-3,6,7,8-tetrahydro-3-methylimidazo[4,5-h][1,4]benzothiazin-2-yl]butanoic acid 2469039-29-8 C16H21Cl2N3O2S
1-(2-Methoxyphenyl)-4-{3-[4-(2-methoxyphenyl)piperazin-1-yl] propyl}piperazine 1-(2-Methoxyphenyl)-4-{3-[4-(2-methoxyphenyl)piperazin-1-yl] propyl}piperazine
D-erythro-Pent-4-enose, 4,5-dideoxy-2,3-O-(1-methylethylidene)- (9CI) D-erythro-Pent-4-enose, 4,5-dideoxy-2,3-O-(1-methylethylidene)- (9CI) 155934-55-7 C8H12O3
Isavuconazole Impurity 41 Isavuconazole Impurity 41
Carbamic acid, N-benzoyl-N-(2-phenylethyl)-, (2R)-1-azabicyclo[2.2.2]oct-2-yl ester Carbamic acid, N-benzoyl-N-(2-phenylethyl)-, (2R)-1-azabicyclo[2.2.2]oct-2-yl ester 1798817-91-0 C23H26N2O3
NA NA
NA NA
NA NA
Cetrorelix Impurity 12 Cetrorelix Impurity 12
Cetrorelix Impurity 5 (6-D-Orn) Cetrorelix Impurity 5 (6-D-Orn)
Tenofovir impurity EE Tenofovir impurity EE
Peramivir Intermediate Impurity 35 Peramivir Intermediate Impurity 35
Peramivir Intermediate Impurity 40 Peramivir Intermediate Impurity 40
Alvatrombopag Impurity 999 Alvatrombopag Impurity 999
NA NA
Palonosetron impurity 30XH Palonosetron impurity 30XH
Pazopanib ImpurityABCDEFGHJKL Pazopanib ImpurityABCDEFGHJKL
1-(4-(2-Dimethylamino)-2-ethoxyphenyl butanone 1-(4-(2-Dimethylamino)-2-ethoxyphenyl butanone 68047-07-4 C20H25NO2
Vonoprazan-050-C4H4O4 Vonoprazan-050-C4H4O4 928325-69-3 C21H19ClFN3O6S
Crisaborole Impurity 45 Crisaborole Impurity 45 1785498-37-4 C7H6Br2O
Sugammadex Impurity 26（Org199129-1） Sugammadex Impurity 26（Org199129-1） 2412953-06-9
Gadobutrol Impurity A Gadobutrol Impurity A
Levocarnitine EP Impurity A(Z) Levocarnitine EP Impurity A(Z)
Penicillin impurity E Penicillin impurity E
4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1,1-bis((5-methylpyridin-3-yl)methyl)piperidin-1-ium 4-(8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1,1-bis((5-methylpyridin-3-yl)methyl)piperidin-1-ium
Bisoprolol Impurity 34 Bisoprolol Impurity 34
Flomoxef Impurity I Flomoxef Impurity I
Ampicillin Impurity C2 Ampicillin Impurity C2
Tegoprazan Impurity 13 Tegoprazan Impurity 13
Nirmatrelvir Impurity 6 Nirmatrelvir Impurity 6
Bumetanide Impurity 25 Bumetanide Impurity 25
Rocuronium Bromide Impurity 16 、17、18 Rocuronium Bromide Impurity 16 、17、18
Roxadustat Impurity 15 Roxadustat Impurity 15
(1S,3S,7S,8S,8aR)-8-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H- pyran-2-yl)ethyl)-3,7-dimethyl-1,2,3,4,6,7,8,8a-octahydronaphthalen- 1-yl 2,2-dimethylbutanoate (1S,3S,7S,8S,8aR)-8-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H- pyran-2-yl)ethyl)-3,7-dimethyl-1,2,3,4,6,7,8,8a-octahydronaphthalen- 1-yl 2,2-dimethylbutanoate 132487-01-5 C25H40O5
3-(hydroxy(2-methyl-1H-imidazol-1-yl)methyl)-9-(hydroxymethyl)-1,2,3,9-tetrahydro-4H-carbazol-4-one 3-(hydroxy(2-methyl-1H-imidazol-1-yl)methyl)-9-(hydroxymethyl)-1,2,3,9-tetrahydro-4H-carbazol-4-one
Perospirone Impurity 18 Perospirone Impurity 18
Perospirone Impurity 3 Perospirone Impurity 3 1002359-81-0 C8H11NO2
Dolutegravir Impurity 13(Sodium Salt) Dolutegravir Impurity 13(Sodium Salt)
Paxlovid Impurity 10 Paxlovid Impurity 10
Fondaparinux sodium impurity 4 Fondaparinux sodium impurity 4
Ampicillin Impurity W Ampicillin Impurity W
2-(5-Acetyl-2-ethoxyphenyl)-5-methyl-7-propyl-imidazo[5,1-f][1,2,4]triazin-4(1H)-one 2-(5-Acetyl-2-ethoxyphenyl)-5-methyl-7-propyl-imidazo[5,1-f][1,2,4]triazin-4(1H)-one 358390-43-9 C19H22N4O3
Empagliflozin Impurity 80 Empagliflozin Impurity 80
Empagliflozin Impurity 92 Empagliflozin Impurity 92
Iohexol Impurity N Iohexol Impurity N
Pitavastatin 5-Oxo Impurity Calcium Salt Pitavastatin 5-Oxo Impurity Calcium Salt 2180095-22-9 C25H24CaFNO4
1-(2-bromo-3,5-dihydroxyphenyl)ethanone 1-(2-bromo-3,5-dihydroxyphenyl)ethanone 2092614-65-6 C8H7BrO3
Lenvatinib impurity LFZZ-18 Lenvatinib impurity LFZZ-18 C11H8Cl2N2O2
Rosuvastatin Impurity 121 Rosuvastatin Impurity 121 140164-51-8 C10H18O5
Brivaracetam Impurity 38 Brivaracetam Impurity 38
Isavuconazole Impurities 04 Isavuconazole Impurities 04
Ticagrelor Impurity 119 Ticagrelor Impurity 119
Ticagrelor Impurity 118 Ticagrelor Impurity 118
D-erythro-Hexonic acid, 2,4-dideoxy-3,5-O-(1-methylethylidene)-, acetate (9CI) D-erythro-Hexonic acid, 2,4-dideoxy-3,5-O-(1-methylethylidene)-, acetate (9CI) 402508-35-4 C11H18O6
L-Alanine, 3-[(S)-(carboxymethyl)sulfinyl]- L-Alanine, 3-[(S)-(carboxymethyl)sulfinyl]- 112246-66-9 C5H9NO5S
2-Propanone, 1-[4,5-dihydro-2-(4-methyl-1-piperazinyl)-4-thioxo-3H-1,5-benzodiazepin-3-ylidene]- 2-Propanone, 1-[4,5-dihydro-2-(4-methyl-1-piperazinyl)-4-thioxo-3H-1,5-benzodiazepin-3-ylidene]- 1902955-67-2 C17H20N4OS
3(2H)-Pyridazinone, 6-[4-(ethylamino)phenyl]-4,5-dihydro-5-methyl- 3(2H)-Pyridazinone, 6-[4-(ethylamino)phenyl]-4,5-dihydro-5-methyl- 52240-42-3 C13H17N3O
Benzoic acid, 4-[[4-(aminocarbonyl)-1-piperidinyl]methyl]- Benzoic acid, 4-[[4-(aminocarbonyl)-1-piperidinyl]methyl]- 938143-02-3 C14H18N2O3
1-(4-methylbenzyl)-1,4,8,11-tetraazacyclotetradecane tetrahydrochloride 1-(4-methylbenzyl)-1,4,8,11-tetraazacyclotetradecane tetrahydrochloride
2,4-bis(1-(2,3-dimethylphenyl)ethyl)-1H-imidazole 2,4-bis(1-(2,3-dimethylphenyl)ethyl)-1H-imidazole
2-((4R,6S)-6-((2-((4R,6S)-6-(hydroxymethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetoxy)methyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetic acid 2-((4R,6S)-6-((2-((4R,6S)-6-(hydroxymethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetoxy)methyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetic acid
1,3-bis(4-((E)-3-methoxy-3-oxoprop-1-en-1-yl)benzyl)-1H-imidazol-3-ium bromide 1,3-bis(4-((E)-3-methoxy-3-oxoprop-1-en-1-yl)benzyl)-1H-imidazol-3-ium bromide
Crisaborole intermediate Crisaborole intermediate 1187230-70-1 C14H14BNO3
Glycine, (2R)-N-[(4-ethyl-2,3-dioxo-1-piperazinyl)carbonyl]-2-phenylglycyl-2-[(2S,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]-, (2R)- Glycine, (2R)-N-[(4-ethyl-2,3-dioxo-1-piperazinyl)carbonyl]-2-phenylglycyl-2-[(2S,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]-, (2R)- 1449784-97-7 C23H29N5O8S
6-Quinolinecarboxamide, 4-[(2-chloro-4-hydroxyphenyl)amino]-7-methoxy- 6-Quinolinecarboxamide, 4-[(2-chloro-4-hydroxyphenyl)amino]-7-methoxy- 2380197-89-5 C17H14ClN3O3
1-Pyrrolidineacetic acid, α-ethyl-2-oxo-4-propyl-, methyl ester, (4R)- 1-Pyrrolidineacetic acid, α-ethyl-2-oxo-4-propyl-, methyl ester, (4R)- 930123-52-7 C12H21NO3
Traxipide impurity Traxipide impurity
Benzeneacetic acid, 4-[2-[4-[1-(2-ethoxyethyl)-1H-benzimidazol-2-yl]-1-piperidinyl]ethyl]-α,α-dimethyl-, methyl ester Benzeneacetic acid, 4-[2-[4-[1-(2-ethoxyethyl)-1H-benzimidazol-2-yl]-1-piperidinyl]ethyl]-α,α-dimethyl-, methyl ester 1181267-38-8 C29H39N3O3
Benzenemethanol, 4-[2-(1-methylethoxy)ethoxy]- Benzenemethanol, 4-[2-(1-methylethoxy)ethoxy]- 1039828-27-7 C12H18O3
Brivaracetam Impurity 7 HCl Brivaracetam Impurity 7 HCl 357338-46-6 C13H27ClN2O3
Bisacodyl Impurity 1 Bisacodyl Impurity 1 13004-51-8 C18H15NO2
Vecuronium Bromide ImpurityACDEFGHJKL Vecuronium Bromide ImpurityACDEFGHJKL
Butanedioic acid, 2-[[2-methyl-1-(phenylmethyl)-1H-imidazol-5-yl]methylene]-, 1-ethyl ester, (2E)- Butanedioic acid, 2-[[2-methyl-1-(phenylmethyl)-1H-imidazol-5-yl]methylene]-, 1-ethyl ester, (2E)- 1640981-02-7 C18H20N2O4
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2452300-94-4 C21H25ClO8
1-Butanone, 1-(4-fluorophenyl)-4-[(6bS,10aS)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxalin-8(7H)-yl]- 1-Butanone, 1-(4-fluorophenyl)-4-[(6bS,10aS)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxalin-8(7H)-yl]- 1576240-15-7 C24H28FN3O
2-bromo-6-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzonitrile 2-bromo-6-(6'-oxo-1'-phenyl-1',6'-dihydro-[2,3'-bipyridin]-5'-yl)benzonitrile
tert-butyl 2-((4R,6S)-6-((E)-2-(4-(2-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate tert-butyl 2-((4R,6S)-6-((E)-2-(4-(2-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate
methyl (3aR,4S,6R,6aS)-4-((tert-butoxycarbonyl)amino)-3-(pentan-3- yl)-3a,5,6,6a-tetrahydro-4H-cyclopenta[d]isoxazole-6-carboxylate methyl (3aR,4S,6R,6aS)-4-((tert-butoxycarbonyl)amino)-3-(pentan-3- yl)-3a,5,6,6a-tetrahydro-4H-cyclopenta[d]isoxazole-6-carboxylate
3-Pyridinecarboxamide, 5-chloro-N-[4-(4-chloro-2-thienyl)-5-(4-cyclohexyl-1-piperazinyl)-2-thiazolyl]-1,6-dihydro-6-oxo-, hydrochloride (1:) 3-Pyridinecarboxamide, 5-chloro-N-[4-(4-chloro-2-thienyl)-5-(4-cyclohexyl-1-piperazinyl)-2-thiazolyl]-1,6-dihydro-6-oxo-, hydrochloride (1:) 570403-05-3 C23H26Cl3N5O2S2
Avatrombopag Impurity 49 Avatrombopag Impurity 49
Avatrombopag Impurity 56 Avatrombopag Impurity 56
Pterosin A-2-O-glucoside Pterosin A-2-O-glucoside
2-(4-(2-(4-(1-(2-hydroxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic acid 2-(4-(2-(4-(1-(2-hydroxyethyl)-1H-benzo[d]imidazol-2-yl)piperidin-1-yl)ethyl)phenyl)-2-methylpropanoic acid C26H33N3O3
2-(4-ethylpiperazin-1-yl)-4-(4-methoxyphenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine 2-(4-ethylpiperazin-1-yl)-4-(4-methoxyphenyl)-5,6,7,8,9,10-hexahydrocycloocta[b]pyridine C24H33N3O
Rosuvastatin Impurity 163 Rosuvastatin Impurity 163
Rosuvastatin Impurity 150 Rosuvastatin Impurity 150
1-[2-(2,4-difluorophenyl)-2,3-epoxypropyl]-1h-1,2,4-triazole 1-[2-(2,4-difluorophenyl)-2,3-epoxypropyl]-1h-1,2,4-triazole 86386-76-7 C11H9F2N3O
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