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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Febuxostat Impurity B Febuxostat Impurity B
Sorafenib Impurity F Sorafenib Impurity F
Trelagliptin Impurity 1 Trelagliptin Impurity 1 1821400-07-0 C21H13ClF2N4O2
Vortioxetine Imp.J Vortioxetine Imp.J 2137588-68-0 C18H22N2S
4-amino-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 4-amino-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide 1608459-56-8 C18H27N3O3
4,5-dichloro Rivaroxaban 4,5-dichloro Rivaroxaban 2305917-61-5 C25H28ClN3O6S
Solifenacin EP Impurity B Solifenacin EP Impurity B 1534326-81-2 C31H28N2O
Vildagliptin Impurity 6 Vildagliptin Impurity 6 1846606-31-2 C17H23N3O2
Flucloxacillin Impurity A Flucloxacillin Impurity A
Nicorandil Impurity 1 Nicorandil Impurity 1
Piperacillin Impurity 6 Piperacillin Impurity 6
Bosutinib Impurity 5 Bosutinib Impurity 5 1391063-17-4 C26H29Cl2N5O3
Afatinib Impurity 14 Afatinib Impurity 14
2-(MethylcarbaMoyl)benzoic acid 2-(MethylcarbaMoyl)benzoic acid 6843-36-3 C9H9NO3
1-(4-(2-Methoxyethyl)phenoxy)-3-(oxiran-2-ylMethoxy)propan-2-ol 1-(4-(2-Methoxyethyl)phenoxy)-3-(oxiran-2-ylMethoxy)propan-2-ol 1416440-64-6 C15H22O5
(3S,4S)-1-benzyl-N,4-diMethylpiperidin-3-aMine (3S,4S)-1-benzyl-N,4-diMethylpiperidin-3-aMine 1354621-59-2 C14H22N2
1H-BenziMidazole-7-carboxylic acid, 1-[[2'-(2,5-dihydro-5-oxo-1,2,4-oxadiazol-3-yl)[1,1'-biphenyl]-4-yl]Methyl] -2-ethoxy-, ethyl ester 1H-BenziMidazole-7-carboxylic acid, 1-[[2'-(2,5-dihydro-5-oxo-1,2,4-oxadiazol-3-yl)[1,1'-biphenyl]-4-yl]Methyl] -2-ethoxy-, ethyl ester 1403474-70-3 C27H24N4O5
6-acetyl-2-aMino-8-cyclopentyl-5-Methylpyrido[2,3-d]pyriMidin-7(8H)-one 6-acetyl-2-aMino-8-cyclopentyl-5-Methylpyrido[2,3-d]pyriMidin-7(8H)-one 571189-64-5 C15H18N4O2
Apixaban-13C-D3 Apixaban-13C-D3 1261393-15-0 C2413CH22D3N5O4
IMp. C (EP): Ethyl [(4-Methylphenyl)sulphonyl]-CarbaMate IMp. C (EP): Ethyl [(4-Methylphenyl)sulphonyl]-CarbaMate
IMp. C (EP): Methyl-2-[4-[2-[(4-Chlorobenzoyl)aMino]ethyl]phenoxy]-2-Methylpropanoate IMp. C (EP): Methyl-2-[4-[2-[(4-Chlorobenzoyl)aMino]ethyl]phenoxy]-2-Methylpropanoate
5-PyriMidinecarboxylic acid, 4-(4-fluorophenyl)-1,2-dihydro-6-(1-Methylethyl)-2-oxo-, Methyl ester 5-PyriMidinecarboxylic acid, 4-(4-fluorophenyl)-1,2-dihydro-6-(1-Methylethyl)-2-oxo-, Methyl ester 488798-37-4 C15H15FN2O3
AgoMelatine DiMer Urea AgoMelatine DiMer Urea 185421-27-6 C27H28N2O3
AgoMelatine DiMer Urea AgoMelatine DiMer Urea 185421-27-6 C27H28N2O3
Isotachysterol3 Isotachysterol3 22350-43-2 C27H44O
Nitrendipine Propyl Ester Nitrendipine Propyl Ester 225785-54-6 C19H22N2O6
O-DesMethyl Urapidil O-DesMethyl Urapidil 91453-03-1 C19H27N5O3
(1R,3R,4R)-Entecavir (1R,3R,4R)-Entecavir 1367369-76-3 C12H15N5O3
5-(5-chloro-1-(2-fluorophenyl)-2-oxopentyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridin-2-yl acetate 5-(5-chloro-1-(2-fluorophenyl)-2-oxopentyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridin-2-yl acetate 1056459-37-0 C20H21ClFNO3S
(2S,3R)-2-((S)-1-(3,5-bis(trifluoroMethyl)phenyl)ethoxy)-3-(4-fluorophenyl)Morpholine (2S,3R)-2-((S)-1-(3,5-bis(trifluoroMethyl)phenyl)ethoxy)-3-(4-fluorophenyl)Morpholine 327623-37-0 C20H18F7NO2
Linagliptin iMpurity Linagliptin iMpurity 2140263-92-7 C25H28N8O2
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxaMide 1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxaMide 256376-62-2 C14H11FN4O
Alogliptin iMpurity Alogliptin iMpurity 60271-06-9 C7H10N2O3
Alogliptin iMpurity Alogliptin iMpurity 60271-06-9 C7H10N2O3
cefaclor iMpurity H cefaclor iMpurity H C4H6N4O3S2
Tadalafil iMpurity E Tadalafil iMpurity E
3,3',5-TRIIODOTHYROPROPIONIC ACID 3,3',5-TRIIODOTHYROPROPIONIC ACID 51-26-3 C15H11I3O4
Cytidine,N-benzoyl-2^-C-Methyl-,3^,5^-dibenzoate(9CI) Cytidine,N-benzoyl-2^-C-Methyl-,3^,5^-dibenzoate(9CI) 863329-64-0 C31H27N3O8
(R)-2-((6-(3-((3-(2-cyanobenzyl)-1-Methyl-2,6-dioxo-1,2,3,6-tetrahydropyriMidin-4-yl)aMino)piperidin-1-yl)-3-Methyl-2,4-dioxo-3,4-dihydropyriMidin-1(2H)-yl)Methyl)benzonitrile (R)-2-((6-(3-((3-(2-cyanobenzyl)-1-Methyl-2,6-dioxo-1,2,3,6-tetrahydropyriMidin-4-yl)aMino)piperidin-1-yl)-3-Methyl-2,4-dioxo-3,4-dihydropyriMidin-1(2H)-yl)Methyl)benzonitrile 1268836-55-0 C31H30N8O4
(R)-2-((6-(3-((3-(2-cyanobenzyl)-1-Methyl-2,6-dioxo-1,2,3,6-tetrahydropyriMidin-4-yl)aMino)piperidin-1-yl)-3-Methyl-2,4-dioxo-3,4-dihydropyriMidin-1(2H)-yl)Methyl)benzonitrile (R)-2-((6-(3-((3-(2-cyanobenzyl)-1-Methyl-2,6-dioxo-1,2,3,6-tetrahydropyriMidin-4-yl)aMino)piperidin-1-yl)-3-Methyl-2,4-dioxo-3,4-dihydropyriMidin-1(2H)-yl)Methyl)benzonitrile 1268836-55-0 C31H30N8O4
1-Pyrrolidinecarboxylic acid, 4-oxo-2-(3-thiazolidinylcarbonyl)-, 1,1-diMethylethyl ester, (2R)- 1-Pyrrolidinecarboxylic acid, 4-oxo-2-(3-thiazolidinylcarbonyl)-, 1,1-diMethylethyl ester, (2R)- 1415908-67-6 C13H20N2O4S
(2R,3S)-2-[(1R)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(phenyl)Morpholine hydrochloride (2R,3S)-2-[(1R)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(phenyl)Morpholine hydrochloride 874460-46-5 C20H20ClF6NO2
AlMotriptan iMpurity AlMotriptan iMpurity
AlMotriptan iMpurity AlMotriptan iMpurity
FaMotidine iMpurity FaMotidine iMpurity 130463-35-3 C5H8N4S2.Na
Nitrendipine iMpurity Nitrendipine iMpurity
TraMadol EP IMpurity-C TraMadol EP IMpurity-C 66170-31-8 C16H24ClNO
Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetic acid) Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetic acid) 1338800-82-0 C17H20N4O2
Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetic acid) Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetic acid) 1338800-82-0 C17H20N4O2
AtracuriuM IMpurity K (Mixture of cis, trans, cis, cis(K1 & K2), tans, trans IsoMer) AtracuriuM IMpurity K (Mixture of cis, trans, cis, cis(K1 & K2), tans, trans IsoMer)
ChlorphenaMine IMpurity B ChlorphenaMine IMpurity B
Clozapine EP IMpurity D Clozapine EP IMpurity D 65514-71-8 C18H21ClN4O
Febuxostat IMpurity (2-(3-carboxy-4-isobutyloxyphenyl)-4-Methylthiazole-5-carboxylic acid) Febuxostat IMpurity (2-(3-carboxy-4-isobutyloxyphenyl)-4-Methylthiazole-5-carboxylic acid)
Fluconazole IMpurity I Fluconazole IMpurity I C13H12F2N6O
IMidafenacin Related CoMpound 1 (4-(1H-IMidzol-1-yl)-2,2-DiphenylbutanaMide) IMidafenacin Related CoMpound 1 (4-(1H-IMidzol-1-yl)-2,2-DiphenylbutanaMide) 170105-20-1 C19H19N3O
IMidafenacin Related CoMpound 6 (4-AcetiMidoylaMino-2,2-DiphenylbutanaMide) IMidafenacin Related CoMpound 6 (4-AcetiMidoylaMino-2,2-DiphenylbutanaMide) 503598-33-2 C18H21N3O
Lansoprazole IMpurity H Lansoprazole IMpurity H 1346598-28-4 C23H16F3N5OS
LevetiracetaM IMurity (L-2-AMinobutanaMide HCl,S-2-AMinobutanaMide HCl) LevetiracetaM IMurity (L-2-AMinobutanaMide HCl,S-2-AMinobutanaMide HCl) 1933471-30-7 C8H14N2O3
Milrinone IMpurity 4 Milrinone IMpurity 4
Nebivolol O-Beta-D-Glucuronide Nebivolol O-Beta-D-Glucuronide 1698091-61-0
Nicergoline IMp. C (EP) Nicergoline IMp. C (EP)
Perindopril IMpurity E Perindopril IMpurity E
Pitavastatin 3-Oxo SodiuM Pitavastatin 3-Oxo SodiuM 2245811-12-3 C25H22FNO4
PraMipexole IMp.BI-II828BS PraMipexole IMp.BI-II828BS C20H32N6S2
Propofol IMpurity F Propofol IMpurity F
Sertraline IMpurity (SRTRC-3) Sertraline IMpurity (SRTRC-3) C17H17Cl2N
Terbutaline IMpurity B Terbutaline IMpurity B 94120-05-5 C13H19NO3
Benzoic acid, 4-[(4-Methyl-1-piperazinyl)Methyl]-3-(trifluoroMethyl)- Benzoic acid, 4-[(4-Methyl-1-piperazinyl)Methyl]-3-(trifluoroMethyl)- 859282-11-4 C14H17F3N2O2
5-chloro-2,3-diphenylpyrazine 5-chloro-2,3-diphenylpyrazine 41270-66-0 C16H11ClN2
Canagliflozin iMpurity Canagliflozin iMpurity
Vortioxetine iMpurity Vortioxetine iMpurity 853745-55-8 C10H14BrClN2
PD 312236 PD 312236 501666-24-6 C20H35NO11
(17α)-3,3-[1,2-Ethanediylbis(oxy)]-17-hydroxy-19-norpregna-5(10),9(11)-diene-21-nitrile (17α)-3,3-[1,2-Ethanediylbis(oxy)]-17-hydroxy-19-norpregna-5(10),9(11)-diene-21-nitrile 190662-30-7 C22H29NO3
(S)-4-(4-Hydrazinobenzyl)-2-oxazolidinone Hydrochloride (S)-4-(4-Hydrazinobenzyl)-2-oxazolidinone Hydrochloride 139264-57-6 C10H14ClN3O2
1-[4-(4-AMino-6,7-diMethoxy-2-quinazolinyl)-1-piperazinyl]-5-hydroxy-1-pentanone 1-[4-(4-AMino-6,7-diMethoxy-2-quinazolinyl)-1-piperazinyl]-5-hydroxy-1-pentanone 109678-71-9 C19H27N5O4
4-[2-(2-AMino-4,5,6,7-tetrahydro-4,6-dioxo-3H-pyrrolo[2,3-d]pyriMidin-5-yl)ethyl]benzoic Acid 4-[2-(2-AMino-4,5,6,7-tetrahydro-4,6-dioxo-3H-pyrrolo[2,3-d]pyriMidin-5-yl)ethyl]benzoic Acid 193265-47-3 C15H14N4O4
9-(1,3-Dioxolan-2-ylMethyl)-3,9-dihydro-1,3-diMethyl-1H-purine-2,6-dione 9-(1,3-Dioxolan-2-ylMethyl)-3,9-dihydro-1,3-diMethyl-1H-purine-2,6-dione 1174289-18-9 C11H14N4O4
DesMethyl AMisulpride DesMethyl AMisulpride 148516-54-5 C16H25N3O4S
DiMethoxy Dienogest DiMethoxy Dienogest 102193-41-9 C22H31NO3
Desfluoro Rosuvastatin Sodium Salt Desfluoro Rosuvastatin Sodium Salt 847849-66-5 C22H29N3O6S
N-Benzoyl-N-[2-(phenyl)ethyl]-N-carbamic Acid R-Quinuclidinol Ester Succinic Acid Salt N-Benzoyl-N-[2-(phenyl)ethyl]-N-carbamic Acid R-Quinuclidinol Ester Succinic Acid Salt 1798817-92-1 C27H32N2O7
Tadalafil EP IMpurity A Tadalafil EP IMpurity A
(1R,3R,4R)-3-AMino-4-hydroxy-cyclohexanecarboxylic acid ethyl ester (1R,3R,4R)-3-AMino-4-hydroxy-cyclohexanecarboxylic acid ethyl ester 1392745-70-8 C14H25NO5
(S)-3-Hydroxypiperidine (S)-3-Hydroxypiperidine 24211-55-0 C5H11NO
Aprepitant iMpurity B Aprepitant iMpurity B
Aripiprazole iMpurity 4 Aripiprazole iMpurity 4 1424857-63-5 C36H42Cl2N4O4
Aripiprazole iMpurity 4 Aripiprazole iMpurity 4 1424857-63-5 C36H42Cl2N4O4
Avanafil IMpurity 8 (R-Avanafil) Avanafil IMpurity 8 (R-Avanafil)
EzetiMibe ring-opening dehydrate iMpurity EzetiMibe ring-opening dehydrate iMpurity 1292292-63-7 C24H21F2NO3
Fondaparinux sodiuM iMpurity 1 Fondaparinux sodiuM iMpurity 1 348625-84-3 C13H21NO19S3
Pitavastatin IMpurity 4 (PP-4) Pitavastatin IMpurity 4 (PP-4) 1422058-54-5 C25H22FNO3
Pregabalin IMpurity Pregabalin IMpurity 159029-27-3 C7H18N2
Valdecoxib 3'-SulfonaMide IMpurity Valdecoxib 3'-SulfonaMide IMpurity 1373038-56-2 C16H14N2O3S
(3R,4R)-4-(2,5-Difluorophenyl)-3-Methyl-4-(1H-1,2,4-triazol-1-ylMethyl)-2-oxetanone (3R,4R)-4-(2,5-Difluorophenyl)-3-Methyl-4-(1H-1,2,4-triazol-1-ylMethyl)-2-oxetanone 483340-20-1 C13H11F2N3O2
6,7-DiMethoxy-2-(4-(tetrahydrofuran-2-carbonyl)piperazin-1-yl)quinazolin-4(1H)-one 6,7-DiMethoxy-2-(4-(tetrahydrofuran-2-carbonyl)piperazin-1-yl)quinazolin-4(1H)-one 1177261-73-2 C19H24N4O5
2-Hydroxy Atorvastatin Calcium Salt 2-Hydroxy Atorvastatin Calcium Salt 265989-46-6 C33H37CaFN2O6
13-oxo-1,4,7,10-Tetraazabicyclo[8.2.1]tridecane-4,7-diacetic Acid 13-oxo-1,4,7,10-Tetraazabicyclo[8.2.1]tridecane-4,7-diacetic Acid 229312-33-8 C13H22N4O5
rac-Clopidogrel Carboxylic Acid Hydrochloride rac-Clopidogrel Carboxylic Acid Hydrochloride 1015247-88-7 C15H15Cl2NO2S
Milnacipran IMpurity Milnacipran IMpurity 810696-16-3 C11H11NO
Terbutaline IMpurity 8 Terbutaline IMpurity 8 28924-20-1 C26H30BrNO3
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