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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Everolimus Related Compound 3 Everolimus Related Compound 3 147438-30-0 C32H49NO9
(R)-isopropyl 2-(((R)-(perfluorophenoxy)(phenoxy)phosphoryl)amino)propanoate (R)-isopropyl 2-(((R)-(perfluorophenoxy)(phenoxy)phosphoryl)amino)propanoate 1627824-09-2 C18H17F5NO5P
Cefuroxime Sodium EP Impurity C Cefuroxime Sodium EP Impurity C 69822-88-4 C15H15N3O6S
Acemetacin EP Impurity F/Carboxymethyl Acemetacin/[[[[[1-(4-Chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl]acetyl]oxy]acetyl]oxy]acetic acid Acemetacin EP Impurity F/Carboxymethyl Acemetacin/[[[[[1-(4-Chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl]acetyl]oxy]acetyl]oxy]acetic acid 76812-49-2 C23H20ClNO8
Cefuroxime Sodium EP Impurity G Cefuroxime Sodium EP Impurity G 97232-98-9 C17H17N3O8S
2-chloro-4-(cyclopentylamino)-5-pyrimidinyl ethanone 2-chloro-4-(cyclopentylamino)-5-pyrimidinyl ethanone 1244949-62-9 C11H14ClN3O
Cetirizine 3-Chloro Impurity Cetirizine 3-Chloro Impurity 1232460-31-9 C21H25ClN2O3
Donepezil Impurity 8 Donepezil Impurity 8 1808997-65-0 C18H23NO4
Rivaroxaban Impurity 23 Rivaroxaban Impurity 23
(Z)-2-(2-aminothiazol-4-yl)-2-(hydroxyimino)acetamide (Z)-2-(2-aminothiazol-4-yl)-2-(hydroxyimino)acetamide 1450758-21-0 C5H6N4O2S
Fosfomycin Trometamol impurity C Fosfomycin Trometamol impurity C 23001-39-0 C4H12NO6P
(R)-1-(3-(dimethylamino)propyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carbonitrile oxalate (R)-1-(3-(dimethylamino)propyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carbonitrile oxalate C22H23FN2O5
1-(7,8-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1-(7,8-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1822601-94-4 C12H15N
Sofosbuvir metabolites Sofosbuvir metabolites 1859162-80-3 C16H18FN2O8P
1,3,5,7-tetrahydroxyadamantane 1,3,5,7-tetrahydroxyadamantane 16104-28-2 C10H16O4
Cabozantinib Impurity E Cabozantinib Impurity E
Loxoprofen Impurity I Loxoprofen Impurity I
Sofosbuvir Impurity22 Sofosbuvir Impurity22
Donepezil Impurity-OH Donepezil Impurity-OH 148517-82-2 C11H12O4
1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-4-(hydroxyamino)pyrimidin-2-one 1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-4-(hydroxyamino)pyrimidin-2-one 13491-41-3 C9H13N3O6
5-(hydroxymethyl)-3-[(5-nitro-2-furyl)methylideneamino]oxazolidin-2-one 5-(hydroxymethyl)-3-[(5-nitro-2-furyl)methylideneamino]oxazolidin-2-one 41359-15-3 C9H9N3O6
2-(3-(4-(7H-Pyrrolo[2,3-d]pyrimidin-2-yl)-1H-pyrazol-1-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile 2-(3-(4-(7H-Pyrrolo[2,3-d]pyrimidin-2-yl)-1H-pyrazol-1-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile C16H17N7O2S
Ipragliflozin Impurity 4 Ipragliflozin Impurity 4
Mupirocin iMpurity 6 Mupirocin iMpurity 6 C26H44O9
Vitamin B1 Impurity 5 Vitamin B1 Impurity 5 2443-50-7 C12H17ClN4OS
Irbesartan IMpurity 16 Irbesartan IMpurity 16 C25H28N6O
479348-49-7 479348-49-7 479348-49-7 C20H19FN2O6
1449029-77-9 1449029-77-9 1449029-77-9 C29H26N4O7
295366-48-2 295366-48-2 295366-48-2 C17H25NO3
(3S,4R)-phenyl 3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-phenyl piperidine-1-carboxylate (3S,4R)-phenyl 3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-phenyl piperidine-1-carboxylate C26H25NO5
Fluticasone Impurity 13 Fluticasone Impurity 13 C25H31F3O5S
nicergoline impurity K nicergoline impurity K
Clopidogrel Impurity 46 Clopidogrel Impurity 46 1801260-21-8 C25H26ClNO6S
Rosuvastatin Impurity 89 Rosuvastatin Impurity 89 2226413-61-0 C38H46F2N6O9S2
Ibuprofen EP Impurity I Ibuprofen EP Impurity I 2143535-26-4 C13H18O2
Moxifloxacin Impurity 11 Moxifloxacin Impurity 11
Linagliptin Impurity 7 Linagliptin Impurity 7 2416949-69-2 C25H29N7O4
Tofacitinib Related Compound 16 Tofacitinib Related Compound 16 2183519-70-0 C15H23N5
Vortioxetine Impurity 8 Vortioxetine Impurity 8
Erlotinib Impurity 21 Erlotinib Impurity 21
Fluvastatin EP Impurity C Fluvastatin EP Impurity C 779995-42-5 C24H26FNO4
Oseltamivir Impurity 17 Oseltamivir Impurity 17 2413185-88-1 C14H22O4
Topiroxostat Impurity 15 Topiroxostat Impurity 15
Teneligliptin Impurity 10 Di-Trifluoroacetate Teneligliptin Impurity 10 Di-Trifluoroacetate
Posaconazole iMpurity 68 Posaconazole iMpurity 68
Erlotinib Hydrochloride iMpurity 50 Erlotinib Hydrochloride iMpurity 50
(S)-methyl 9,10-difluoro-3-methyl-7-oxo-3,7-dihydro-2H-[1,4]oxazino [2,3,4-ij]quinoline-6-carboxylate (S)-methyl 9,10-difluoro-3-methyl-7-oxo-3,7-dihydro-2H-[1,4]oxazino [2,3,4-ij]quinoline-6-carboxylate 1213269-49-8 C14H11F2NO4
Vonoprazan Impurity U3 Vonoprazan Impurity U3
Prucalopride Impurity 10/ethyl 4-(4-amino-5-chloro-2,3-dihydrobenzofuran-7-carboxamido)piperidine-1-carboxylate Prucalopride Impurity 10/ethyl 4-(4-amino-5-chloro-2,3-dihydrobenzofuran-7-carboxamido)piperidine-1-carboxylate 137211-63-3 C17H22ClN3O4
Cefonicid Impurity 1 Cefonicid Impurity 1
1589503-93-4 1589503-93-4 1589503-93-4 C27H24F2N6O3S
Afatinib Impurity OLQ Afatinib Impurity OLQ
Androstane-3,17-diol,2-(4-morpholinyl)-16-(1-pyrrolidinyl) Androstane-3,17-diol,2-(4-morpholinyl)-16-(1-pyrrolidinyl) 119302-22-6 C31H50N2O5
Landiolol impurity W Landiolol impurity W
(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
Metoprolol IMpurity T Metoprolol IMpurity T C15H25NO3
Teneligliptin Impurity 11 Teneligliptin Impurity 11 2131105-24-1 C25H35N5O4
Teneligliptin Impurity 16 Teneligliptin Impurity 16
IMP-EP-M IMP-EP-M 1193104-80-1 C60H79N2O15S+
Hyoscine Butylbromide EP Impurity H Hyoscine Butylbromide EP Impurity H
2-((4S,6S)-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetic acid 2-((4S,6S)-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetic acid 2165770-84-1 C10H19NO4
Androstane-2,17-diol, 3-(4-morpholinyl)-16-(1-pyrrolidinyl)-, (2α,3β,5α,16β,17β)- Androstane-2,17-diol, 3-(4-morpholinyl)-16-(1-pyrrolidinyl)-, (2α,3β,5α,16β,17β)- 1252016-49-1 C27H46N2O3
(S)-N,N-dimethyl-3-((R)-3-(naphthalen-1-yloxy)-1-phenylpropoxy)-1-phenylpropan-1-amine (S)-N,N-dimethyl-3-((R)-3-(naphthalen-1-yloxy)-1-phenylpropoxy)-1-phenylpropan-1-amine C30H33NO2
ETHYL 4-CHLORO-2-HYDROXYIMINO-3-OXO-BUTYRATE ETHYL 4-CHLORO-2-HYDROXYIMINO-3-OXO-BUTYRATE 66338-95-2 C6H8ClNO4
2-((R)-3-(diisopropylamino)-1-phenylpropyl)-4-(1-hydroxyethyl)phenyl isobutyrate 2-((R)-3-(diisopropylamino)-1-phenylpropyl)-4-(1-hydroxyethyl)phenyl isobutyrate C27H39NO3
NA NA
Palbociclib impurity LAAP Palbociclib impurity LAAP
(R)-N-((S)-1-amino-1-oxobutan-2-yl)-3-((((S)-1-amino-1-oxobutan-2-yl)amino)methyl)hexanamide (R)-N-((S)-1-amino-1-oxobutan-2-yl)-3-((((S)-1-amino-1-oxobutan-2-yl)amino)methyl)hexanamide C15H30N4O3
Dapagliflozin Impurity 32 Dapagliflozin Impurity 32 1528636-07-8 C22H27ClO7
1,1'-(1,4-phenylenebis(methylene))bis(1,4,8,11-tetraazacyclotetradecane 1-oxide) 1,1'-(1,4-phenylenebis(methylene))bis(1,4,8,11-tetraazacyclotetradecane 1-oxide) C28H54N8O2
N-(2-amino-6-oxo-3,6-dihydropyrimidin-4-yl)- N-(2-amino-6-oxo-3,6-dihydropyrimidin-4-yl)-
Droxidopa Impurity 6 Droxidopa Impurity 6 90044-46-5 C16H15NO4
Dofetilide Impurity B Dofetilide Impurity B
Sugammadex Monohydroxy Impurity Sugammadex Monohydroxy Impurity
Cyclic Macitentan quarternary salt Impurity Cyclic Macitentan quarternary salt Impurity
Lacosamide Impurity – K Lacosamide Impurity – K
Cefdinir CP Impurity I&J&K&L Cefdinir CP Impurity I&J&K&L
Dapoxetine Impurity 41 Dapoxetine Impurity 41
Doxofylline Impurity 16 Doxofylline Impurity 16
Olopatadine Impurity 5 Olopatadine Impurity 5 55690-18-1 C17H16O5
Taladafil Impurity 38 Taladafil Impurity 38
Salbutamol impurity 41 Salbutamol impurity 41
Gadobutrol Impurity 20 Gadobutrol Impurity 20
Dapagliflozin Impurity 48 Dapagliflozin Impurity 48 2069934-29-6 C15H14Cl2O
Cilostazol Impurity I Cilostazol Impurity I
Pramipexole DBTA Impurity Pramipexole DBTA Impurity 1821389-09-6 C7H8N2S
Amoxicillin Oxidized Impurities Amoxicillin Oxidized Impurities
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