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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Zolmitriptan N-Oxide Zolmitriptan N-Oxide 251451-30-6 C16H21N3O3
3-(hydroxymethyl)-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one 3-(hydroxymethyl)-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one
7-CHLORO-1,3DIHYDRO-5-FLUOROPHENYL-2-NITRO-METHYLENE-2H-1,4-BENZODIAZEPINE-4-OXIDE 7-CHLORO-1,3DIHYDRO-5-FLUOROPHENYL-2-NITRO-METHYLENE-2H-1,4-BENZODIAZEPINE-4-OXIDE 60656-76-0 C16H11ClFN3O3
17alpha-Hydroxytrenbolone 17alpha-Hydroxytrenbolone 80657-17-6 C18H22O2
3,4-dihydroxybutanoic acid 3,4-dihydroxybutanoic acid 1518-61-2 C4H8O4
Isocyclosporin A Isocyclosporin A 59865-16-6 C62H111N11O12
GINKGOLIC ACIDS GINKGOLIC ACIDS
R-DULOXETINE HYDROCHLORIDE R-DULOXETINE HYDROCHLORIDE 910138-96-4 C18H20ClNOS
diltiazem hydrochloride diltiazem hydrochloride 103532-27-0 C22H27ClN2O4S
(R)-Terazosin (R)-Terazosin 109351-34-0 C19H25N5O4
Methyl (1S,4R)-4-Amino-2-Cyclopentene-1-Carboxylate Methyl (1S,4R)-4-Amino-2-Cyclopentene-1-Carboxylate 138923-03-2 C7H11NO2
L-Alanine,propylester(9CI) L-Alanine,propylester(9CI) 58989-06-3 C6H13NO2
N-hydroxyphenetidine N-hydroxyphenetidine 38246-95-6
bergaptol-O-glucopyranoside bergaptol-O-glucopyranoside 131623-13-7 C17H16O9
pefloxacin N-oxide pefloxacin N-oxide 85145-21-7 C17H20FN3O4
2,3-dimethyl-1,4-naphthoquinone 2,3-dimethyl-1,4-naphthoquinone 2197-57-1 C12H10O2
(1-ETHYL-3-PIPERIDINYL)METHYLAMINE (1-ETHYL-3-PIPERIDINYL)METHYLAMINE 102459-02-9 C8H18N2
8-HYDROXY MIRTAZAPINE 8-HYDROXY MIRTAZAPINE 102335-57-9 C17H19N3O
4-(4-fluoro-3-(piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one 4-(4-fluoro-3-(piperazine-1-carbonyl)benzyl)phthalazin-1(2H)-one 763111-47-3 C20H19FN4O2
1-[2-Amino-1-(4-benzyloxyphenyl)-ethyl]-cyclohexanol 1-[2-Amino-1-(4-benzyloxyphenyl)-ethyl]-cyclohexanol 93413-61-7 C23H31NO2
N-Deshydroxyethyl Dasatinib N-Deshydroxyethyl Dasatinib 910297-51-7 C20H22ClN7OS
N-Desethyl Sunitinib N-Desethyl Sunitinib 356068-97-8 C20H23FN4O2
6-(4-{2-[5-(tert-Butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 6-(4-{2-[5-(tert-Butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 140710-90-3 C33H58O2Si
3-Hydroxy loratadine 3-Hydroxy loratadine 183483-15-0 C22H23ClN2O3
Dehydro Lacidipine Dehydro Lacidipine 130996-24-6 C26H31NO6
Granisetron Impurity F Granisetron Impurity F 1364914-39-5 C18H24N4O
Solifenacin N-Oxide Solifenacin N-Oxide 180272-28-0 C23H26N2O3
2-chloro-N-(4-ethoxyphenyl)-4-nitrobenzamide 2-chloro-N-(4-ethoxyphenyl)-4-nitrobenzamide 328258-90-8 C15H13ClN2O4
ACETAMINOPHEN IMPURITY B ACETAMINOPHEN IMPURITY B 1693-37-4 C9H11NO2
2-chloro-N-(3-chloro-2-methylphenyl)nicotinamide 2-chloro-N-(3-chloro-2-methylphenyl)nicotinamide 57841-61-9 C13H10Cl2N2O
(R)-3-Amino-3-phenylpropionic acid (R)-3-Amino-3-phenylpropionic acid 13921-90-9 C9H11NO2
4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide. 4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide. 139756-03-9 C17H22N4O3
N-Hydroxy Riluzole N-Hydroxy Riluzole 179070-90-7 C8H5F3N2O2S
2-piperazine-4-amino-6,7-dimethoxyquinazoline Hydrochloride 2-piperazine-4-amino-6,7-dimethoxyquinazoline Hydrochloride 70843-11-7 C14H20ClN5O2
1-(3-Aminopropyl)aziridine 1-(3-Aminopropyl)aziridine 1072-65-7 C5H12N2
3,5-Di(4-pyridinyl)-1H-1,2,4-triazol-1-amine 3,5-Di(4-pyridinyl)-1H-1,2,4-triazol-1-amine 4923-06-2 C12H10N6
(1α,2β,4β,5α)-9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-7α-ol (1α,2β,4β,5α)-9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-7α-ol 498-46-4 C8H13NO2
Ambroxol EP Impurity B Ambroxol EP Impurity B 18683-95-9 C14H18Br2N2O
16-Hydroxyerythromycin 16-Hydroxyerythromycin 82230-93-1 C37H67NO14
4-[1-(4-Chlorophenyl)-1-phenylethoxy]-1-methylhexahydro-1H-azepine 4-[1-(4-Chlorophenyl)-1-phenylethoxy]-1-methylhexahydro-1H-azepine 61771-18-4 C21H26ClNO
1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylic acid 3-isopropyl 5-(2-hydroxyethyl) ester 1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylic acid 3-isopropyl 5-(2-hydroxyethyl) ester 82219-47-4 C20H24N2O7
3-[(3-TRIFLUOROMETHYL)PHENYL]-1-PROPENE 3-[(3-TRIFLUOROMETHYL)PHENYL]-1-PROPENE 1813-96-3 C10H9F3
(AS)-A-(2-CHLOROPHENYL)-2,3,6,7-TETRAHYDRO-2-OXO-THIENO[3,2-C]PYRIDINE-5(4H)-ACETIC ACID METHYL ESTER (AS)-A-(2-CHLOROPHENYL)-2,3,6,7-TETRAHYDRO-2-OXO-THIENO[3,2-C]PYRIDINE-5(4H)-ACETIC ACID METHYL ESTER 527687-26-9 C16H16ClNO3S
1-(P-METHOXYPHENYL)-1-BUTEN-3-ONE 1-(P-METHOXYPHENYL)-1-BUTEN-3-ONE 943-88-4 C11H12O2
ANAGRELIDE IMPURITY 5 ANAGRELIDE IMPURITY 5 444904-63-6 C8H7Cl2N3
2-[2-(2-AMINO-9H-PURIN-9-YL)ETHYL]-1,3-PROPANEDIOL 2-[2-(2-AMINO-9H-PURIN-9-YL)ETHYL]-1,3-PROPANEDIOL 104227-86-3 C10H15N5O2
1,4,8,11-Tetrakis[(4-methylphenyl)sulfonyl]-1,4,8,11-tetraazacyclotetradecane 1,4,8,11-Tetrakis[(4-methylphenyl)sulfonyl]-1,4,8,11-tetraazacyclotetradecane 71089-74-2 C38H48N4O8S4
3-Cyano-4-isobutoxybenzoic acid 3-Cyano-4-isobutoxybenzoic acid 528607-60-5 C12H13NO3
REF DUPL: trans-2-Hydroxymethyl-5-(cytosin-1-yl)-1,3-oxathiolane REF DUPL: trans-2-Hydroxymethyl-5-(cytosin-1-yl)-1,3-oxathiolane 139757-68-9 C8H11N3O3S
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
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
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
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
FaMotidine iMpurity FaMotidine iMpurity 130463-35-3 C5H9N4NaS2
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
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
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
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