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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Amoxicillin Oxidized Impurities Amoxicillin Oxidized Impurities
Amoxicillin Oxidized Impurities Amoxicillin Oxidized Impurities
(2R,3R,4R,5R)-5-(4-benzaMido-2-oxopyriMidin-1(2H)-yl)-2-((benzoyloxy)Methyl)-4-chloro-4-Methyltetrahydrofuran-3-yl benzoate (2R,3R,4R,5R)-5-(4-benzaMido-2-oxopyriMidin-1(2H)-yl)-2-((benzoyloxy)Methyl)-4-chloro-4-Methyltetrahydrofuran-3-yl benzoate 1496551-70-2 C31H26ClN3O7
1-((2R,3S,4R,5R)-3,4-dihydroxy-5-(hydroxyMethyl)-3-Methyltetrahydrofuran-2-yl)pyriMidine-2,4(1H,3H)-dione 1-((2R,3S,4R,5R)-3,4-dihydroxy-5-(hydroxyMethyl)-3-Methyltetrahydrofuran-2-yl)pyriMidine-2,4(1H,3H)-dione 114262-49-6 C10H14N2O6
4-(4-(3-(4-chloro-3-(trifluoroMethyl)phenyl)ureido)-3-fluorophenoxy)-2-(MethylcarbaMoyl)pyridine 1-oxide 4-(4-(3-(4-chloro-3-(trifluoroMethyl)phenyl)ureido)-3-fluorophenoxy)-2-(MethylcarbaMoyl)pyridine 1-oxide 835621-11-9 C21H15ClF4N4O4
D-threo-Pentitol, 2,5-anhydro-1,3,4-trideoxy-2-C-(2,4-difluorophenyl)-4-[[4-[4-[4-[1-(1-ethylpropyl)-1,5-dihydro-5-oxo-4H-1,2,4-triazol-4-yl]phenyl]-1-piperazinyl]phenoxy]Methyl]-1-(1H-1,2,4-triazol-1-yl)- D-threo-Pentitol, 2,5-anhydro-1,3,4-trideoxy-2-C-(2,4-difluorophenyl)-4-[[4-[4-[4-[1-(1-ethylpropyl)-1,5-dihydro-5-oxo-4H-1,2,4-triazol-4-yl]phenyl]-1-piperazinyl]phenoxy]Methyl]-1-(1H-1,2,4-triazol-1-yl)- 161532-65-6 C37H42F2N8O3
1-[1-(4-Chlorophenyl)cyclobutyl]-3-methylbutan-1-one 1-[1-(4-Chlorophenyl)cyclobutyl]-3-methylbutan-1-one 186521-85-7 C15H19ClO
NSC 351869 NSC 351869 31350-27-3 C14H14N2O4
4-Amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-iodo-2-methoxybenzamide 4-Amino-N-[(1-ethyl-2-pyrrolidinyl)methyl]-5-iodo-2-methoxybenzamide 176849-91-5 C15H22IN3O2
N,N'-Vis[2-(3,4-dimethoxyphenyl)ethyl]-N,N'-dimethyl-1,3-propanediamine dihydrochloride N,N'-Vis[2-(3,4-dimethoxyphenyl)ethyl]-N,N'-dimethyl-1,3-propanediamine dihydrochloride 63434-11-7 C25H39ClN2O4
(2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-aMino-2-Methylpentanoic acid hydrochloride (2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-aMino-2-Methylpentanoic acid hydrochloride 1038924-71-8 C18H22ClNO2
(3R,4S,5S,6R)-2-[4-chloro-3-[[4-[(3S)-oxolan-3-yl]oxyphenyl]methyl]phenyl]-6-(hydroxymethyl)-2-methoxyoxane-3,4,5-triol (3R,4S,5S,6R)-2-[4-chloro-3-[[4-[(3S)-oxolan-3-yl]oxyphenyl]methyl]phenyl]-6-(hydroxymethyl)-2-methoxyoxane-3,4,5-triol 915095-96-4 C24H29ClO8
Doxorubicin Imp B HBr salt Doxorubicin Imp B HBr salt 148218-14-8 C29H35Br2NO11
(R)-2-(Boc-aMino)-2-phenylethyl 4-Methylbenzenesulfonate (R)-2-(Boc-aMino)-2-phenylethyl 4-Methylbenzenesulfonate 126610-77-3 C20H25NO5S
(2R,3R,4R,5S)-5-(4-chloro-3-(4-((S)-tetrahydrofuran-3-yloxy)benzyl)phenyl)-2-(2-hydroxyethyl)tetrahydrofuran-2,3,4-triol (2R,3R,4R,5S)-5-(4-chloro-3-(4-((S)-tetrahydrofuran-3-yloxy)benzyl)phenyl)-2-(2-hydroxyethyl)tetrahydrofuran-2,3,4-triol C23H27ClO7
Pyrido[2,3-d]pyriMidin-7(8H)-one, 8-cyclopentyl-5-Methyl-2-[[5-(1-piperazinyl)-2-pyridinyl]aMino]-, hydrochloride (1:) Pyrido[2,3-d]pyriMidin-7(8H)-one, 8-cyclopentyl-5-Methyl-2-[[5-(1-piperazinyl)-2-pyridinyl]aMino]-, hydrochloride (1:) 571189-66-7 C22H28ClN7O
Olaparib iMpurity Olaparib iMpurity 2905342-00-7 C24H25FN4O4
(2S,3R,4R)-2-(4-chloro-3-(4-ethoxybenzyl)phenyl)-5-((S)-1,2-dihydroxyethyl)tetrahydrofuran-3,4-diol (2S,3R,4R)-2-(4-chloro-3-(4-ethoxybenzyl)phenyl)-5-((S)-1,2-dihydroxyethyl)tetrahydrofuran-3,4-diol C21H25ClO6
(R)-Methyl 3-aMino-4-(2,4,5-trifluorophenyl) butanoate .(R)-2-hydroxy-2-phenylacetate (R)-Methyl 3-aMino-4-(2,4,5-trifluorophenyl) butanoate .(R)-2-hydroxy-2-phenylacetate 1253055-94-5 C19H20F3NO5
Olaparib iMpurity A Olaparib iMpurity A
(1S,2S,3R,5S)-3-(7-chloro-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-chloro-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol C14H20ClN5O4S
Posaconazole iMpurity 5 Posaconazole iMpurity 5
APST-ZA APST-ZA 635705-72-5 C20H22N2O6S
Topiroxostat Impurity 5 Topiroxostat Impurity 5 1199273-82-9 C14H7N7
N-Ethoxycarbonyl Ciprofloxacin N-Ethoxycarbonyl Ciprofloxacin 93594-29-7 C20H22FN3O5
Norepinephrine Tartrate Impurity G Norepinephrine Tartrate Impurity G 13062-58-3 C22H21NO3
Vortioxetine Impurity 1 Vortioxetine Impurity 1 1293489-71-0 C17H20N2S
4-bromo-2-nitropyridine 4-bromo-2-nitropyridine 909712-10-3 C5H3BrN2O2
Acemetacin Impurity F Acemetacin Impurity F
1,3-Bis(1H-1,2,4-triazol-1-yl)-2-propanone 1,3-Bis(1H-1,2,4-triazol-1-yl)-2-propanone 98414-56-3 C7H8N6O
2-[[(3aR,4S,6R,6aS)-6-(7-azanyl-5-propylsulfanyl-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-2,2-dimethyl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]oxy]ethanol 2-[[(3aR,4S,6R,6aS)-6-(7-azanyl-5-propylsulfanyl-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-2,2-dimethyl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]oxy]ethanol 1354945-69-9 C17H26N6O4S
Vonoprazan Impurity E Vonoprazan Impurity E
Disalicylimide Disalicylimide 1972-71-0 C14H11NO4
Atomoxetine impurity D Atomoxetine impurity D 1643684-02-9 C17H21NO
(2S,4S)-5-(Biphenyl-4-yl)-4-[(3-carboxypropionyl)amino]-2-methylpentanoic acid ethyl ester,calcium salt(2:1) (2S,4S)-5-(Biphenyl-4-yl)-4-[(3-carboxypropionyl)amino]-2-methylpentanoic acid ethyl ester,calcium salt(2:1)
3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one 3-[(Dimethylamino)methyl]-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one 153139-56-1 C16H20N2O
6-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-
7,9-dihydro-8H-purin-8-one 6-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)- 7,9-dihydro-8H-purin-8-one 1361569-10-9 C18H13FN8O
Apremilast impurity 32 Apremilast impurity 32
Baricitinib Impurity 5 Baricitinib Impurity 5
Bendamustine Impurity 28 Bendamustine Impurity 28
Bortezomib Impurity 20 Bortezomib Impurity 20
Canagliflozin Impurity 27 Canagliflozin Impurity 27 2265214-89-7 C18H14BrFS
Edoxaban Impurity 23 (1S,2S,4R) Edoxaban Impurity 23 (1S,2S,4R)
Edoxaban Impurity 38 Edoxaban Impurity 38 2081883-53-4 C14H27N3O3
Ezetimibe Impurity 33 Ezetimibe Impurity 33 1829558-53-3 C13H10FNO
Imatinib Impurity 14 Imatinib Impurity 14
Levofloxacin Impurity 20 Levofloxacin Impurity 20 2489671-29-4 C18H20FN3O4
Pantoprazole Impurity 12 Pantoprazole Impurity 12
Solifenacin Related Compound 7 Solifenacin Related Compound 7
Vonoprazan Impurity 12 Vonoprazan Impurity 12 3058423-29-0 C23H21F2N3
Avibactam Impurity A Avibactam Impurity A
Avibactam Impurity F Avibactam Impurity F
Brexpiprazole Impurity K Brexpiprazole Impurity K
Cefaclor Impurity 3 Cefaclor Impurity 3
Milrinone Impurity 7 Milrinone Impurity 7 2250242-59-0 C14H13N3O
Silodosin Impurity 1 Silodosin Impurity 1
Sulpiride Impurity 1 Sulpiride Impurity 1
Tenofovir Impurity 54 Tenofovir Impurity 54
Trelagliptin Impurity Y Trelagliptin Impurity Y 1938080-42-2 C13H10FN3O3
Trelagliptin Impurity Y Trelagliptin Impurity Y 1938080-42-2 C13H10FN3O3
Cefathiamidine Impurity 10 Cefathiamidine Impurity 10
Nebivolol Impurity 3 Nebivolol Impurity 3 1029684-20-5 C18H20FNO2
Pemetrexed Pemetrexed 155405-79-1 C12H13BrO3
ethyl 2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5-
carboxylate ethyl 2-(4-butoxy-3-cyanophenyl)-4-methylthiazole-5- carboxylate 2230270-05-8 C18H20N2O3S
Cefminox Sodium Impurity 6 Cefminox Sodium Impurity 6
Flurbiprofen Impurity 7 Flurbiprofen Impurity 7
Imidafenacin Impurity 8 Imidafenacin Impurity 8 503598-05-8 C20H21N3O3
Pregabalin Impurity E Pregabalin Impurity E 1239692-16-0 C11H24ClNO2
Rosuvastatin Impurity 86 Rosuvastatin Impurity 86
Cefathiamidine Impurity 8 Cefathiamidine Impurity 8
Urapidil impurity 7 Urapidil impurity 7 108997-11-1 C24H34N4O2
methyl 3-[[4-chloro-2-(phenylamino)phenyl]methylamino]-3-oxopropanoate. methyl 3-[[4-chloro-2-(phenylamino)phenyl]methylamino]-3-oxopropanoate. 2089061-92-5 C17H17ClN2O3
Pregabalin Impurity 15 Pregabalin Impurity 15
Pregabalin Impurity 32 Pregabalin Impurity 32
4-Hydroxyphthalic Acid 4-Hydroxyphthalic Acid 501666-22-4 C14H25NO6
3-(4-FLUORO-PHENYL)-1-ISOPROPYL-1H-INDOLE-2-CARBALDEHYDE 3-(4-FLUORO-PHENYL)-1-ISOPROPYL-1H-INDOLE-2-CARBALDEHYDE 101125-34-2 C18H16FNO
3,4-DIMETHOXY-2-HYDROXYBENZALDEHYDE 3,4-DIMETHOXY-2-HYDROXYBENZALDEHYDE 19283-70-6 C9H10O4
PIVALOYLOXYMETHYL 6-AMINOPENICILANATE PIVALOYLOXYMETHYL 6-AMINOPENICILANATE 25031-08-7 C14H22N2O5S
1H-Benzimidazole, 6-chloro-7-methyl-2-[(2S)-2-methyl-2-pyrrolidinyl]- 1H-Benzimidazole, 6-chloro-7-methyl-2-[(2S)-2-methyl-2-pyrrolidinyl]- 1788946-71-3 C13H16ClN3
(9S)-9-Amino-9-deoxoerythromycin (9S)-9-Amino-9-deoxoerythromycin 26116-56-3 C37H70N2O12
NSC525120 NSC525120 10221-08-6 C8H7Cl3
3-(2-cyanoethyl-(2-hydroxyethyl)amino)propanenitrile 3-(2-cyanoethyl-(2-hydroxyethyl)amino)propanenitrile 6305-56-2 C8H13N3O
TRANS-4-[[(2-AMINOPHENYL)METHYL]AMINO]-CYCLOHEXANOL TRANS-4-[[(2-AMINOPHENYL)METHYL]AMINO]-CYCLOHEXANOL 46727-91-7 C13H20N2O
Citalopram Related Compound F Citalopram Related Compound F
Lexithromycin Lexithromycin 53066-26-5 C38H70N2O13
methylprednisolone 17-hemisuccinate methylprednisolone 17-hemisuccinate 77074-42-1 C26H34O8
N-Nitroso Macitentan N-Nitroso Macitentan
8-hydroxymethylriboflavin 8-hydroxymethylriboflavin 52134-62-0 C17H20N4O7
(R)-2-(3-(((3-(4-methoxyphenoxy)propyl)amino)methyl)phenoxy)butanoic acid (R)-2-(3-(((3-(4-methoxyphenoxy)propyl)amino)methyl)phenoxy)butanoic acid
RS 42358-197 RS 42358-197 135729-55-4 C19H23ClN2O
acetylthiamine acetylthiamine 3419-28-1
deacetylcephalosporin C deacetylcephalosporin C 1476-46-6 C14H19N3O7S
ETHYLVANILLINBETA-D-GLUCOPYRANOSIDE ETHYLVANILLINBETA-D-GLUCOPYRANOSIDE 122397-96-0 C15H20O8
4-(2-Cyanophenyl)benzyl alcohol 4-(2-Cyanophenyl)benzyl alcohol 154709-19-0 C14H11NO
1-Propanol, 3-[[2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-3-methyl-4-pyridinyl]oxy]- 1-Propanol, 3-[[2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-3-methyl-4-pyridinyl]oxy]- 117976-94-0 C17H19N3O3S
2',3'-O-isopropylidene cytidine 2',3'-O-isopropylidene cytidine 362-42-5 C12H17N3O5
4,4''-Dimethoxyazoxybenzene 4,4''-Dimethoxyazoxybenzene 501-58-6 C14H14N2O2
3,5-Dibenzyloxy terbutalline 3,5-Dibenzyloxy terbutalline 28924-25-6 C26H31NO3
1H-BENZIMIDAZOLE,2-CHLORO-1-(2-ETHOXYETHYL) 1H-BENZIMIDAZOLE,2-CHLORO-1-(2-ETHOXYETHYL) 87233-54-3 C11H13ClN2O
2,2-Dimethyl-4-isopropyl-1,3-benzodioxole (Propofol Impurity L) 2,2-Dimethyl-4-isopropyl-1,3-benzodioxole (Propofol Impurity L) 201166-22-5 C12H16O2
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