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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
2-(DiethylaMino)-N-(2,4-diMethylphenyl)acetaMide Hydrochloride 2-(DiethylaMino)-N-(2,4-diMethylphenyl)acetaMide Hydrochloride 17289-54-2 C14H23ClN2O
3-(5-Methyl-1H-iMidazol-1-yl)-5-(trifluoroMethyl)benzenaMine 3-(5-Methyl-1H-iMidazol-1-yl)-5-(trifluoroMethyl)benzenaMine 641571-16-6 C11H10F3N3
4-[[3-(4-Methylphenyl)-3-oxo-1-(trifluoroMethyl)propylidene]aMino]benzenesulfonaMide 4-[[3-(4-Methylphenyl)-3-oxo-1-(trifluoroMethyl)propylidene]aMino]benzenesulfonaMide 1061214-09-2 C17H15F3N2O3S
5-(Ethoxycarbonyl)-2-(hydroxyMethyl-6-Methyl-4-(3-nitrophenyl)nicotinic Acid 5-(Ethoxycarbonyl)-2-(hydroxyMethyl-6-Methyl-4-(3-nitrophenyl)nicotinic Acid 89267-43-6 C17H16N2O7
9-L-β-Aspartic acid-daptoMycin 9-L-β-Aspartic acid-daptoMycin 123180-72-3 C72H101N17O26
Chlorhexidine Digluconate IMpurity K Chlorhexidine Digluconate IMpurity K 1381962-77-1 C22H29Cl2N9O
Cyclopropyl 3-Fluorobenzyl Ketone Cyclopropyl 3-Fluorobenzyl Ketone 952722-64-4 C11H11FO
Linear DaptoMycin Linear DaptoMycin 883991-21-7 C72H103N17O27
N,N-DiMethylaMidino) Urea N,N-DiMethylaMidino) Urea 98026-16-5 C4H10N4O
rac Dehydro-O-desMethyl Venlafaxine rac Dehydro-O-desMethyl Venlafaxine 1346600-38-1 C16H23NO
3-HYDROXY DESLORATADINE HCL 3-HYDROXY DESLORATADINE HCL 119410-08-1 C19H19ClN2O
2-Fluoro-α-(2-methyl-1-oxopropyl)-γ-oxo-N,β-diphenyl-benzenebutanamide 2-Fluoro-α-(2-methyl-1-oxopropyl)-γ-oxo-N,β-diphenyl-benzenebutanamide 1797905-42-0 C26H24FNO3
Atorvastatin Lactam Lactone Atorvastatin Lactam Lactone 1795791-15-9 C33H31FN2O5
Vinorelbine N'b-Oxide Sulfate Salt Vinorelbine N'b-Oxide Sulfate Salt 74075-34-6 C45H54N4O9
Linagliptin iMpurity G Linagliptin iMpurity G 668270-11-9 C25H28N8O2
Tadalafil EP IMpurity F Tadalafil EP IMpurity F
(2R,3R,4R,5S)-5-(4-benzaMido-2-oxopyriMidin-1(2H)-yl)-2-((benzoyloxy)Methyl)-4-fluoro-4-Methyltetrahydrofuran-3-yl benzoate (2R,3R,4R,5S)-5-(4-benzaMido-2-oxopyriMidin-1(2H)-yl)-2-((benzoyloxy)Methyl)-4-fluoro-4-Methyltetrahydrofuran-3-yl benzoate 874638-94-5 C31H26FN3O7
CefuroxiMe sodiuM iMpurity B CefuroxiMe sodiuM iMpurity B C16H16N4NaO8S
1,1-BIS-(4-ISOBUTYLPHENYL)ETHANE 1,1-BIS-(4-ISOBUTYLPHENYL)ETHANE 102120-87-6 C22H30
8-hydroxyclomipramine 8-hydroxyclomipramine 83385-97-1 C19H23ClN2O
Ro 15-3505 Ro 15-3505 78756-33-9 C15H14ClN3O3
L 683519 L 683519 132172-14-6 C43H67NO12
benzylpenicilloic acid benzylpenicilloic acid 13057-98-2 C16H20N2O5S
erythralosamine erythralosamine 546-57-6 C29H49NO8
6-methylprednisone 6-methylprednisone 91523-05-6 C22H28O5
HYDROXYMETHYL CELECOXIB HYDROXYMETHYL CELECOXIB 170571-00-3 C17H14F3N3O3S
2-(2-cyanophenyl)benzonitrile 2-(2-cyanophenyl)benzonitrile 4341-02-0 C14H8N2
ETHYL (1R,5R,6R)-5-(1-ETHYLPROPOXY)-7-AZABICYCLO[4.1.0]HEPT-3-ENE-3-CARBOXYLATE ETHYL (1R,5R,6R)-5-(1-ETHYLPROPOXY)-7-AZABICYCLO[4.1.0]HEPT-3-ENE-3-CARBOXYLATE 204255-02-7 C14H23NO3
(1,1-DIOXIDO-3-OXO-1,2-BENZISOTHIAZOL-2(3H)-YL)ACETIC ACID (1,1-DIOXIDO-3-OXO-1,2-BENZISOTHIAZOL-2(3H)-YL)ACETIC ACID 52188-11-1 C9H7NO5S
N-(3-AMINOPROPYL)DIETHANOLAMINE N-(3-AMINOPROPYL)DIETHANOLAMINE 4985-85-7 C7H18N2O2
2-Methylpropaneboronic acid (1S,2S,3R,5S)-(+)-2,3-pinanediol ester 2-Methylpropaneboronic acid (1S,2S,3R,5S)-(+)-2,3-pinanediol ester 84110-34-9 C14H25BO2
N-(2,4-dimethylphenyl)piperidine-2-carboxamide N-(2,4-dimethylphenyl)piperidine-2-carboxamide 99552-32-6 C14H20N2O
pyrrolidinyl)-, (2β,3α,5α,16β,17β)- pyrrolidinyl)-, (2β,3α,5α,16β,17β)- 144209-33-6 C27H46N2O2
(4S,6S)-6-[2-[2-(4-Fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]ethyl]-2,2-dimethyl-1,3-dioxane-4-acetic Acid 1,1-Dimethylethyl Ester (4S,6S)-6-[2-[2-(4-Fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]ethyl]-2,2-dimethyl-1,3-dioxane-4-acetic Acid 1,1-Dimethylethyl Ester 472967-95-6 C40H47FN2O5
6a-Methylprednisone 21-Acetate 6a-Methylprednisone 21-Acetate 115321-98-7 C24H30O6
Aztreonam Amide Aztreonam Amide 1219444-93-5 C13H20N6O8S2
N'-[(2Z)-Piperazin-2-ylidene]trifluoroacetohydrazide N'-[(2Z)-Piperazin-2-ylidene]trifluoroacetohydrazide 763105-70-0 C6H9F3N4O
2-Methyl-4-nitro-1H-imidazole-1-acetic acid 2-Methyl-4-nitro-1H-imidazole-1-acetic acid 16230-87-8 C6H7N3O4
Benzofuran-5-carboxylic acid Benzofuran-5-carboxylic acid 90721-27-0 C9H6O3
7-Chloro-1,6,7,8-tetradeoxy-6-[[[(2S)-1-methyl-4β-propyl-2α-pyrrolidinyl]carbonyl]amino]-1-(methylsulfinyl)-α-L-threo-D-galacto-octopyranose 7-Chloro-1,6,7,8-tetradeoxy-6-[[[(2S)-1-methyl-4β-propyl-2α-pyrrolidinyl]carbonyl]amino]-1-(methylsulfinyl)-α-L-threo-D-galacto-octopyranose 22431-46-5 C18H33ClN2O6S
2-(Propylthio)-4(1H)-pyrimidinone 2-(Propylthio)-4(1H)-pyrimidinone 54460-95-6 C7H10N2OS
Fasudil N-hydroxy iMpurity Fasudil N-hydroxy iMpurity 1350827-92-7 C14H17N3O3S
TaMsulosin IMpurity A TaMsulosin IMpurity A C20H28N2O5S
1-((2'-cyanobiphenyl-4-yl)Methyl)-2-ethoxy-1H-benziMidazole-7-carboxylic acid 1-((2'-cyanobiphenyl-4-yl)Methyl)-2-ethoxy-1H-benziMidazole-7-carboxylic acid 632322-61-3 C24H19N3O3
4-[4-(diMethylaMino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxyMethyl)-benzonitrile (CitalopraM Olefinic IMpurity) 4-[4-(diMethylaMino)-1-(4-fluorophenyl)-1-buten-1-yl]-3-(hydroxyMethyl)-benzonitrile (CitalopraM Olefinic IMpurity) 920282-75-3 C20H21FN2O
2-(2-(4-(Dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)ethoxy)ethyl Acetate 2-(2-(4-(Dibenzo[b,f][1,4]thiazepin-11-yl)piperazin-1-yl)ethoxy)ethyl Acetate 844639-07-2 C23H27N3O3S
4-O-DesMethyl 4-O-Ethyl TriMethopriM 4-O-DesMethyl 4-O-Ethyl TriMethopriM 78025-68-0 C15H20N4O3
1-[[(2E)-3-Phenyl-2-propen-1-yl]oxy]naphthalene 1-[[(2E)-3-Phenyl-2-propen-1-yl]oxy]naphthalene 1091626-77-5 C19H16O
α-[[[2-(4-Methoxyphenyl)-1-Methylethyl](phenylMethyl)aMino]Methyl]-3-nitro-4-(phenylMethoxy)benzeneMethanol α-[[[2-(4-Methoxyphenyl)-1-Methylethyl](phenylMethyl)aMino]Methyl]-3-nitro-4-(phenylMethoxy)benzeneMethanol 43229-67-0 C32H34N2O5
Indacaterol IMrity Indacaterol IMrity 1235445-80-3 C24H28N2O3
Topiroxostat IMpurity Topiroxostat IMpurity
Flurbiprofen Impurity 17 Flurbiprofen Impurity 17 1206101-29-2 C24H16F2
Azilsartan Impurity Azilsartan Impurity 1586011-04-2 C26H25N3O4
1,2-Bis(piperazin-1-yl)benzene 1,2-Bis(piperazin-1-yl)benzene 1446750-99-7 C14H22N4
4-PYRIDINECARBOXIMIDIC ACID, HYDRAZIDE 4-PYRIDINECARBOXIMIDIC ACID, HYDRAZIDE 89830-71-7 C6H8N4
2-PENTANOYLBENZOIC ACID 2-PENTANOYLBENZOIC ACID 550-37-8 C12H14O3
Meropenem Impurity MAP-B Meropenem Impurity MAP-B
(S,E)-N-(4-((3-chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-hydroxybut-2-enamide (S,E)-N-(4-((3-chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-hydroxybut-2-enamide
5-Methoxy-2-Hydroxy Benzimidazole 5-Methoxy-2-Hydroxy Benzimidazole 208-75-3 C13H9N
SODIUM CAMPTOTHECIN SODIUM CAMPTOTHECIN 25387-67-1 C20H17N2NaO5
(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-L-cysteine (5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-L-cysteine 2238849-52-8 C13H15N3O3S
isopropyl 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate isopropyl 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate
N-(3-chloro-4-fluorophenyl)-7-fluoro-6,8-dinitroquinazolin-4-amine N-(3-chloro-4-fluorophenyl)-7-fluoro-6,8-dinitroquinazolin-4-amine
(S)-4-(((2R,4S,5S,6S)-4-amino-5-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-5,12-dihydroxy-7-methoxy-6,11-dioxo-3,4,6,11-tetrahydrotetracene-2-carboxylic acid (S)-4-(((2R,4S,5S,6S)-4-amino-5-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-5,12-dihydroxy-7-methoxy-6,11-dioxo-3,4,6,11-tetrahydrotetracene-2-carboxylic acid
3-Azabicyclo[3.1.0]hexane-2-carboxamide, N-[(1R)-1-cyano-2-[(3S)-2-oxo-3-pyrrolidinyl]ethyl]-3-[(2S)-3,3-dimethyl-1-oxo-2-[(2,2,2-trifluoroacetyl)amino]butyl]-6,6-dimethyl-, (1R,2S,5S)- 3-Azabicyclo[3.1.0]hexane-2-carboxamide, N-[(1R)-1-cyano-2-[(3S)-2-oxo-3-pyrrolidinyl]ethyl]-3-[(2S)-3,3-dimethyl-1-oxo-2-[(2,2,2-trifluoroacetyl)amino]butyl]-6,6-dimethyl-, (1R,2S,5S)- 2755812-41-8 C23H32F3N5O4
3-(4-cyanophenoxy)benzyl acetate 3-(4-cyanophenoxy)benzyl acetate
Mirtazapine N-Oxide Mirtazapine N-Oxide 155172-12-6 C17H19N3O
3-Oxo Citalopram 3-Oxo Citalopram 372941-54-3 C20H19FN2O2
Quetiapine N-Oxide Quetiapine N-Oxide 1076199-40-0 C21H25N3O3S
Celebrex Carboxylic Acid Methyl Ester Celebrex Carboxylic Acid Methyl Ester 1189893-75-1 C18H14F3N3O4S
(S)-BoroLeu-(-)-Pinanediol-hydrochloride (S)-BoroLeu-(-)-Pinanediol-hydrochloride 945606-99-5 C15H29BClNO2
BROMOSULBACTAM BROMOSULBACTAM 75527-87-6 C8H10BrNO5S
(S)-PYRROLIDINE-2-CARBONITRILE (S)-PYRROLIDINE-2-CARBONITRILE 204387-53-1 C5H8N2
1-(CHLOROACETYL)-L-PROLINE METHYL ESTER 1-(CHLOROACETYL)-L-PROLINE METHYL ESTER 38074-72-5 C8H12ClNO3
1-(4-PIPERIDINYLCARBONYL)-4-PIPERIDINECARBOXYLIC ACID 1-(4-PIPERIDINYLCARBONYL)-4-PIPERIDINECARBOXYLIC ACID 96053-48-4 C12H20N2O3
1-(3-PYRIDYL)ETHAN-1-ONE OXIME 1-(3-PYRIDYL)ETHAN-1-ONE OXIME 5973-83-1 C7H8N2O
1-(3,4,5-Trimethoxy-benzyl)-piperazinedihydrochloride 1-(3,4,5-Trimethoxy-benzyl)-piperazinedihydrochloride 107049-57-0 C14H24Cl2N2O3
Sitagliptin N-Sulfate Sitagliptin N-Sulfate 940002-57-3 C16H15F6N5O4S
1-Oxo Mirtazapine (Mirtazapine Impurity C) 1-Oxo Mirtazapine (Mirtazapine Impurity C) 191546-96-0 C17H17N3O
N-(2,6-Dimethylphenyl)-2-(ethylmethylamino)acetamide Hydrochloride_x000b_(Lidocaine Impurity E) N-(2,6-Dimethylphenyl)-2-(ethylmethylamino)acetamide Hydrochloride_x000b_(Lidocaine Impurity E) 50295-20-0 C13H21ClN2O
ent-Cinacalcet Hydrochloride ent-Cinacalcet Hydrochloride 694495-47-1 C22H22F3N
Nsc529487 Nsc529487 3310-47-2 C9H13N3O6
Oxathiolan 5fu-.B. Oxathiolan 5fu-.B. 145986-11-4 C8H9FN2O4S
Decarboxy Enrofloxacin Decarboxy Enrofloxacin 131775-99-0 C18H22FN3O
Desethanol Dipyridamole Desethanol Dipyridamole 1176886-12-6 C22H36N8O3
2’’-Desethyl-2’’-vinyl Simvastatin 2’’-Desethyl-2’’-vinyl Simvastatin 1449248-72-9 C25H36O5
1,2-Dihydro Dexamethasone 1,2-Dihydro Dexamethasone 426-17-5 C22H31FO5
Lamotrigine N2-Oxide Lamotrigine N2-Oxide 136565-76-9 C9H7Cl2N5O
4-[3-(Methylamino)-1-(2-thienyl)propyl]- 4-[3-(Methylamino)-1-(2-thienyl)propyl]- 949096-01-9 C18H20BrNOS
N-Isopropyl Carvedilol N-Isopropyl Carvedilol 1246819-01-1 C27H32N2O4
5-Oxo Atorvastatin 5-Oxo Atorvastatin 1391052-82-6 C33H33FN2O5
1-Methyl-12-thioxopyrido[1,2,3,4]imidazole-[1,2-a]benzimidazole-2(12H)-one 1-Methyl-12-thioxopyrido[1,2,3,4]imidazole-[1,2-a]benzimidazole-2(12H)-one 1246819-06-6 C14H9N3OS
Quetiapine Hydroxy Impurity Quetiapine Hydroxy Impurity 329216-67-3 C19H21N3OS
7-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene (Raloxifene Impurity) 7-[4-(2-Piperidinyl)ethoxy]benzoyl Raloxifene (Raloxifene Impurity) 1159977-58-8 C42H44N2O6S
rac N-Demethyl Promethazine Hydrochloride rac N-Demethyl Promethazine Hydrochloride 60113-77-1 C16H19ClN2S
Lincomycin B Hydrochloride Lincomycin B Hydrochloride 11021-35-5 C17H33ClN2O6S
Flucloxacillin impurity C Flucloxacillin impurity C
1-[2-amino-1-(4-hydroxyphenyl)ethyl]cyclohexanol 1-[2-amino-1-(4-hydroxyphenyl)ethyl]cyclohexanol 149289-29-2 C14H21NO2
(2E)-3-(Dimethylamino)-1-(3-pyridyl)prop-2-en-1-one (2E)-3-(Dimethylamino)-1-(3-pyridyl)prop-2-en-1-one 123367-26-0 C10H12N2O
5-(2R)-2-Oxiranyl-8-benzyloxy-2(1H)-quinolinone 5-(2R)-2-Oxiranyl-8-benzyloxy-2(1H)-quinolinone 173140-90-4 C18H15NO3
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