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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
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
Benzonitrile, 2-[(3,4-dihydro-6-methoxy-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl)methyl]- Benzonitrile, 2-[(3,4-dihydro-6-methoxy-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl)methyl]- 2514763-78-9 C14H13N3O3
Benzonitrile, 2-[(3,4-dihydro-6-methoxy-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl)methyl]- Benzonitrile, 2-[(3,4-dihydro-6-methoxy-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl)methyl]- 2514763-78-9 C14H13N3O3
5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 3-[(1E)-2-(4-methyl-5-thiazolyl)ethenyl]-8-oxo-7-[(2-phenylacetyl)amino]-, (4-methoxyphenyl)methyl ester, (6R,7R)- 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 3-[(1E)-2-(4-methyl-5-thiazolyl)ethenyl]-8-oxo-7-[(2-phenylacetyl)amino]-, (4-methoxyphenyl)methyl ester, (6R,7R)- 104146-11-4 C29H27N3O5S2
Perospirone Impurity 26 Perospirone Impurity 26
Paxlovid Impurity 15 Paxlovid Impurity 15
3-(2-(cyclopent-2-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide 3-(2-(cyclopent-2-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide
Canagliflozin Impurity 84 Canagliflozin Impurity 84
Fondaparinux sodium impurity 18 Fondaparinux sodium impurity 18
Fondaparinux sodium impurity 13 Fondaparinux sodium impurity 13
Siponimod Impurity 10 Siponimod Impurity 10
Lasmiditan Impurity 1 Lasmiditan Impurity 1
Aciclovir Impurity 7 Aciclovir Impurity 7
(5R,6R)-6-((R)-1-hydroxyethyl)-3-((R)-tetrahydrofuran-2-yl)-4-thia-1-azabicyclo[3.2.0]hept-2-en-7-one (5R,6R)-6-((R)-1-hydroxyethyl)-3-((R)-tetrahydrofuran-2-yl)-4-thia-1-azabicyclo[3.2.0]hept-2-en-7-one
Olodaterol Impurity 22 Olodaterol Impurity 22
Olodaterol Impurity 25 Olodaterol Impurity 25
Deiodo Trametinib Deiodo Trametinib 871700-65-1 C26H24FN5O4
32,43,50-Tricarboxy-cyanoco balamin 32,43,50-Tricarboxy-cyanoco balamin
Butanoic acid, 2-[3-[[2-benzoxazolyl[3-(4-hydroxyphenoxy)propyl]amino]methyl]phenoxy]- Butanoic acid, 2-[3-[[2-benzoxazolyl[3-(4-hydroxyphenoxy)propyl]amino]methyl]phenoxy]- 848260-34-4 C27H28N2O6
(S)-Azelastine (S)-Azelastine 143228-85-7 C22H24ClN3O
Relugolix Impurity 92 Relugolix Impurity 92
N-Desethyl Vardenafil N-Desethyl Vardenafil 448184-46-1 C21H28N6O4S
O-Desmethyl Gefitinib O-Desmethyl Gefitinib 847949-49-9 C21H22ClFN4O3
Pyrazole N-Demethyl Sildenafil Pyrazole N-Demethyl Sildenafil 139755-95-6 C21H28N6O4S
S-(-)-Tolterodine S-(-)-Tolterodine 124937-53-7 C22H31NO
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
Valdecoxib 3'-SulfonaMide IMpurity Valdecoxib 3'-SulfonaMide IMpurity 1373038-56-2 C16H14N2O3S
4'-O-2,6-Dideoxy-3-O-Methyl-α-L-arabino-hexopyranosyl SelaMectin 4'-O-2,6-Dideoxy-3-O-Methyl-α-L-arabino-hexopyranosyl SelaMectin 301849-46-7 C50H75NO14
(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
Etoricoxib IMpurity Etoricoxib IMpurity 1350206-14-2 C18H16N2O2S
4-Acetyl-2-fluorobiphenyl 4-Acetyl-2-fluorobiphenyl 42771-79-9 C14H11FO
m-xylene-4,alpha,alpha'-triol m-xylene-4,alpha,alpha'-triol 2937-60-2 C8H10O3
Oseltamivir Impurity 107 Oseltamivir Impurity 107
Oseltamivir Impurity 66 Oseltamivir Impurity 66
Dapagliflozin Impurity 46 Dapagliflozin Impurity 46
Brexpiprazole Impurity ABCDEFGHJKL Brexpiprazole Impurity ABCDEFGHJKL
Acetamide, N-[4-[3-cyclopropyl-5-[(2-fluoro-4-iodophenyl)amino]-3,4,6,7-tetrahydro-6,8-dimethyl-2,4,7-trioxopyrido[4,3-d]pyrimidin-1(2H)-yl]phenyl]- Acetamide, N-[4-[3-cyclopropyl-5-[(2-fluoro-4-iodophenyl)amino]-3,4,6,7-tetrahydro-6,8-dimethyl-2,4,7-trioxopyrido[4,3-d]pyrimidin-1(2H)-yl]phenyl]- 871701-23-4 C26H23FIN5O4
p,p'-(2-pyridylmethylene)bisphenol p,p'-(2-pyridylmethylene)bisphenol 603-41-8 C18H15NO2
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
Methanone, [(2S)-2-(6-chloro-7-methyl-1H-benzimidazol-2-yl)-2-methyl-1-pyrrolidinyl][5-hydroxy-2-(2H-1,2,3-triazol-2-yl)phenyl]- Methanone, [(2S)-2-(6-chloro-7-methyl-1H-benzimidazol-2-yl)-2-methyl-1-pyrrolidinyl][5-hydroxy-2-(2H-1,2,3-triazol-2-yl)phenyl]- 2901043-05-6 C22H21ClN6O2
6-(1-Cyclopropyl-1H-pyrazol-4-yl)-3-[difluoro(6-fluoro-2H-indazol-5-yl)methyl]-1,2,4-triazolo[4,3-b]pyridazine 6-(1-Cyclopropyl-1H-pyrazol-4-yl)-3-[difluoro(6-fluoro-2H-indazol-5-yl)methyl]-1,2,4-triazolo[4,3-b]pyridazine 1440964-95-3 C19H13F3N8
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
Nemonoxacin Impurity 8 Nemonoxacin Impurity 8 2770004-82-3 C24H29N3O8
SALVIAMILTIORRHIZA SALVIAMILTIORRHIZA
(1-ETHYL-3-PIPERIDINYL)METHYLAMINE (1-ETHYL-3-PIPERIDINYL)METHYLAMINE 102459-02-9 C8H18N2
(1S,2R)-2-(((2,4-dimethylpyrimidin-5-yl)oxy)methyl)-2-(3-fluorophenyl)-N-(5-fluoropyridin-2-yl)cyclopropanecarboxamide (1S,2R)-2-(((2,4-dimethylpyrimidin-5-yl)oxy)methyl)-2-(3-fluorophenyl)-N-(5-fluoropyridin-2-yl)cyclopropanecarboxamide
Lemborexant impurity 14 Lemborexant impurity 14
8-HYDROXY MIRTAZAPINE 8-HYDROXY MIRTAZAPINE 102335-57-9 C17H19N3O
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
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
Lenacapavir impurity Lenacapavir impurity 3025145-48-3 C41H36ClF10N7O5S2
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
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