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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
6,6'-oxybis(3-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzoic acid) 6,6'-oxybis(3-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzoic acid)
4-Pyrimidineethanol, 6-bromo-α-(2,4-difluorophenyl)-5-fluoro-β-methyl-α-(1H-1,2,4-triazol-1-ylmethyl)- 4-Pyrimidineethanol, 6-bromo-α-(2,4-difluorophenyl)-5-fluoro-β-methyl-α-(1H-1,2,4-triazol-1-ylmethyl)- 1307315-04-3 C16H13BrF3N5O
Cycloocta[b]pyridine, 2-(4-ethyl-1,4-dioxido-1-piperazinyl)-4-(4-fluorophenyl)-5,6,7,8,9,10-hexahydro- Cycloocta[b]pyridine, 2-(4-ethyl-1,4-dioxido-1-piperazinyl)-4-(4-fluorophenyl)-5,6,7,8,9,10-hexahydro- 2247538-61-8 C23H30FN3O2
Vonoprazan Impurity B-3 Vonoprazan Impurity B-3
3-Azetidineacetamide, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 3-Azetidineacetamide, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 2271228-51-2 C16H19N7O3S
Budesonide Impurity 26 Budesonide Impurity 26
Peramivir Impurity 48 Peramivir Impurity 48
NA NA
3-Quinolinemethanol, 2-cyclopropyl-4-phenyl- 3-Quinolinemethanol, 2-cyclopropyl-4-phenyl- 2153433-73-7 C19H17NO
Avatrombopag Impurity 37 Avatrombopag Impurity 37
Piperacillin ImpurityABCDEFGHI Piperacillin ImpurityABCDEFGHI
5,6-DIMETHOXY-2-PYRIDIN-4-YLMETHYL-INDAN-1-ONE 5,6-DIMETHOXY-2-PYRIDIN-4-YLMETHYL-INDAN-1-ONE 4803-57-0 C17H17NO3
3-(Dimethylamino)-1-(2-thienyl)-1-propanol 3-(Dimethylamino)-1-(2-thienyl)-1-propanol 13636-02-7 C9H15NOS
Benzamide, 2,5-dichloro-N-(3-methylbutyl)- Benzamide, 2,5-dichloro-N-(3-methylbutyl)- 349086-08-4 C12H15Cl2NO
BECLOTIAMINE BECLOTIAMINE 13471-78-8 C12H16Cl2N4S
methyl 5-sulpho-o-anisate methyl 5-sulpho-o-anisate 94134-07-3 C9H10O6S
2,4-dioxo-3-azaspiro[5.5]undecane-1,5-dicarbonitrile 2,4-dioxo-3-azaspiro[5.5]undecane-1,5-dicarbonitrile 4355-15-1 C12H13N3O2
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2412953-11-6 C72H112O49S8
Sulfamide, N-[5-phenyl-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N'-propyl- Sulfamide, N-[5-phenyl-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N'-propyl- 2300968-85-6 C19H22N6O4S
Acetamide, 2-chloro-N-(2-chloroacetyl)-N-(2,6-dimethylphenyl)- Acetamide, 2-chloro-N-(2-chloroacetyl)-N-(2,6-dimethylphenyl)- 112843-97-7 C12H13Cl2NO2
1-[2-cyano-1-(cyanoimino)ethyl]piperidine 1-[2-cyano-1-(cyanoimino)ethyl]piperidine 56488-00-7 C9H12N4
Oseltamivir Impurity 99 Oseltamivir Impurity 99
Oseltamivir Impurity 92 Oseltamivir Impurity 92
Oseltamivir Impurity 76 Oseltamivir Impurity 76
Regorafenib Impurity ABCDEFGHJKL Regorafenib Impurity ABCDEFGHJKL
(S)-2-((1r,3R,5R,7S)-3-hydroxyadamantan-1-yl)-1-iminohexahydro pyrrolo[1,2-a]pyrazin-4(1H)-one hydrochloride (S)-2-((1r,3R,5R,7S)-3-hydroxyadamantan-1-yl)-1-iminohexahydro pyrrolo[1,2-a]pyrazin-4(1H)-one hydrochloride
Benzonitrile, 4-[2-[(1R,2S)-2-(2,5-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-4-thiazolyl]-, rel- Benzonitrile, 4-[2-[(1R,2S)-2-(2,5-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-4-thiazolyl]-, rel- 1797905-83-9 C22H17F2N5OS
3,4,5-Piperidinetriol, 1-(2-hydroxyethyl)-2-(hydroxymethyl)-, (2S,3S,4R,5S)- 3,4,5-Piperidinetriol, 1-(2-hydroxyethyl)-2-(hydroxymethyl)-, (2S,3S,4R,5S)- 1550201-56-3 C8H17NO5
1-(2,4-difluoro-6-hydroxyphenyl)prop-2-en-1-one 1-(2,4-difluoro-6-hydroxyphenyl)prop-2-en-1-one
1-(4-fluorophenyl)-1,3-dihydro-1-[3-(methylamino)propyl]isobenzofuran-5-carbonitrile 1-(4-fluorophenyl)-1,3-dihydro-1-[3-(methylamino)propyl]isobenzofuran-5-carbonitrile 62498-67-3 C19H19FN2O
17,21-Dihydroxy-16α-methylpregna-1,4,9(11)-triene-3,20-dione 21-Acetate 17,21-Dihydroxy-16α-methylpregna-1,4,9(11)-triene-3,20-dione 21-Acetate 10106-41-9 C24H30O5
2-chloro-N-(2,4-dimethylphenyl)acetamide 2-chloro-N-(2,4-dimethylphenyl)acetamide 39106-10-0 C10H12ClNO
sodium [2S-(2alpha,5alpha,6beta)]-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate sodium [2S-(2alpha,5alpha,6beta)]-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 73335-78-1 C8H9BrNNaO3S
8-chloro-3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione 8-chloro-3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione 4921-49-7 C8H9ClN4O2
2-amino-1-(3,4-dihydroxyphenyl)ethan-1-one 2-amino-1-(3,4-dihydroxyphenyl)ethan-1-one 499-61-6 C8H9NO3
Benzoic acid, 5-(aminosulfonyl)-2-[[[4-methoxy-3-(methoxycarbonyl)phenyl]sulfonyl]oxy]-, methyl ester Benzoic acid, 5-(aminosulfonyl)-2-[[[4-methoxy-3-(methoxycarbonyl)phenyl]sulfonyl]oxy]-, methyl ester 2267259-70-9 C17H17NO10S2
7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9,10-difluoro-2,3-dihydro-2-methyl-7-oxo-, (S)- (9CI) 7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9,10-difluoro-2,3-dihydro-2-methyl-7-oxo-, (S)- (9CI) 129798-65-8 C13H9F2NO4
Sitagliptin EP Impurity 1 Sitagliptin EP Impurity 1
4,6-Methano-1,3,2-benzodioxaborole-2-methanamine, hexahydro-3a,8,8-trimethyl-α-(2-methylpropyl)-, (αS,3aR,4R,6R,7aS)-, 2,2,2-trifluoroacetate (1:1) 4,6-Methano-1,3,2-benzodioxaborole-2-methanamine, hexahydro-3a,8,8-trimethyl-α-(2-methylpropyl)-, (αS,3aR,4R,6R,7aS)-, 2,2,2-trifluoroacetate (1:1) 2363753-29-9 C17H29BF3NO4
Beprostatin impurity 3 Beprostatin impurity 3
endo-(±)-8-aza-8-isopropylbicyclo[3.2.1]oct-3-yl (hydroxymethyl)phenylacetate endo-(±)-8-aza-8-isopropylbicyclo[3.2.1]oct-3-yl (hydroxymethyl)phenylacetate 22235-81-0 C19H27NO3
8,11-Dioxa-3,5-diazadodecanoic acid, 12-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)-10-(hydroxymethyl)-2,6-bis(1-methylethyl)-7-oxo-, 2-[(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy]-3-hydroxypropyl ester, (2S,6S)- 8,11-Dioxa-3,5-diazadodecanoic acid, 12-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)-10-(hydroxymethyl)-2,6-bis(1-methylethyl)-7-oxo-, 2-[(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy]-3-hydroxypropyl ester, (2S,6S)- 1654737-35-5 C29H44N12O10
(1R,3r,5S,8R)-8-butyl-3-(((S)-3-hydroxy-2-phenylpropanoyl)oxy)-8-methyl-8-azabicyclo[3.2.1]octan-8-ium (1R,3r,5S,8R)-8-butyl-3-(((S)-3-hydroxy-2-phenylpropanoyl)oxy)-8-methyl-8-azabicyclo[3.2.1]octan-8-ium 99571-66-1 C21H32NO3+
1,3-dihydro-1-oxoisobenzofuran-5-carboxamide 1,3-dihydro-1-oxoisobenzofuran-5-carboxamide 85118-25-8 C9H7NO3
(R)-8-(3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-2-((4-methylquinazolin-2-yl)methoxy)-3,7-dihydro-6H-purin-6-one (R)-8-(3-aminopiperidin-1-yl)-7-(but-2-yn-1-yl)-3-methyl-2-((4-methylquinazolin-2-yl)methoxy)-3,7-dihydro-6H-purin-6-one 2446799-72-8 C25H28N8O2
Troxipide Impurity 8 Troxipide Impurity 8
Peramivir Impurity 12/11 Peramivir Impurity 12/11
(1S,2R,3R,4R)-3-((S)-1-acetamido-2-ethylbutyl)-4-guanidino-2-hydroxycyclopentane-1-carboxylic acid (1S,2R,3R,4R)-3-((S)-1-acetamido-2-ethylbutyl)-4-guanidino-2-hydroxycyclopentane-1-carboxylic acid
Ceftazidime Impurity IMPA Ceftazidime Impurity IMPA
Pitavastatin Impurity 82 Pitavastatin Impurity 82
NA NA
Peramivir Intermediate impurity 2 Peramivir Intermediate impurity 2
Cetrorelix Impurity 8 (+L-Pro) Cetrorelix Impurity 8 (+L-Pro)
Peramivir Intermediate Impurity 44 Peramivir Intermediate Impurity 44
4,5-Dibromo-1,2-benzenediol 4,5-Dibromo-1,2-benzenediol 2563-26-0 C6H4Br2O2
METOPROLOL IMPURITY D METOPROLOL IMPURITY D C15H25NO3
NITRENDIPINE IMPURITY A NITRENDIPINE IMPURITY A
TAMSULOSIN IMPURITY D TAMSULOSIN IMPURITY D C20H28N2O5S
Macitentan Hydroxy amine Impurity Macitentan Hydroxy amine Impurity 2211059-05-9 C12H12BrN3O2
1,3-diethyl-1,3-dimethylurea 1,3-diethyl-1,3-dimethylurea 31468-19-6 C7H16N2O
2,4(1H,3H)-Pyrimidinedione, 6-[(3R)-3-amino-1-piperidinyl]-3-methyl- 2,4(1H,3H)-Pyrimidinedione, 6-[(3R)-3-amino-1-piperidinyl]-3-methyl- 2276323-24-9 C10H16N4O2
7H-Purine-7-acetic acid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-, ethyl ester 7H-Purine-7-acetic acid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-, ethyl ester 7029-96-1 C11H14N4O4
N-(2-Amino-4,5,6,7-tetrahydro-benzothiazol-6-yl)-acrylamide N-(2-Amino-4,5,6,7-tetrahydro-benzothiazol-6-yl)-acrylamide
Rifampin Impurity 6 Rifampin Impurity 6
Cefuroxime Dioxide Impurity(Cefuroxime Sulfoxide) Cefuroxime Dioxide Impurity(Cefuroxime Sulfoxide)
Ampicillin Impurity F(USP) Ampicillin Impurity F(USP)
Azlocillin Opern-Ring Acetylation Impurity Azlocillin Opern-Ring Acetylation Impurity
Miconazole Impurity G(EP) Miconazole Impurity G(EP) 1370335-40-2 C18H14Cl4N2O
2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one 2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one
2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 52549-22-1 C15H11NO3
1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1289559-76-7 C6H6ClFN2O
Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine 56161-71-8 C17H18F3NO
(Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine (Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine
Ceftriaxone sodium impurity 09 Ceftriaxone sodium impurity 09
Cefradine Impurity 8 Cefradine Impurity 8 30959-67-2 C16H19N3O4S
Dobutamine Impurity 3 Dobutamine Impurity 3 334947-75-0 C19H25NO3
Anastrozole Impurity 19 Anastrozole Impurity 19 1301724-97-9 C19H21N3O2
Biotin Impurity Biotin Impurity 171232-73-8 C19H18N2O2S
PANTOPRAZOLE N-OXIDE PANTOPRAZOLE N-OXIDE 953787-60-5 C16H15F2N3O5S
2-[4-(3-CHLORO-2-HYDROXYPROPOXY)PHENYL]ACETAMIDE 2-[4-(3-CHLORO-2-HYDROXYPROPOXY)PHENYL]ACETAMIDE 115538-83-5 C11H14ClNO3
Ibuprofen Alcohol Ibuprofen Alcohol 36039-36-8 C13H20O
Sugammadex sodium Impurity 52 Sugammadex sodium Impurity 52
Sugammadex sodium Impurity 43 Sugammadex sodium Impurity 43
Sugammadex sodium Impurity 39 Sugammadex sodium Impurity 39
Apixaban Impurity 52 Apixaban Impurity 52 1620494-31-6 C31H29N5O4
Cefazolin Impurity EP-J Cefazolin Impurity EP-J
Cabozantinib impurity 41 Cabozantinib impurity 41
Cabozantinib impurity 67 Cabozantinib impurity 67
ethyl 6-bromo-2-(bromomethyl)-5-hydroxy-1-methyl-1H-indole-3-carboxylate ethyl 6-bromo-2-(bromomethyl)-5-hydroxy-1-methyl-1H-indole-3-carboxylate 149246-36-6 C13H13Br2NO3
Dapoxetine impurity 50 Dapoxetine impurity 50
Doxofylline Impurity 18 Doxofylline Impurity 18
Dapoxetine impurity 63 Dapoxetine impurity 63
Dapoxetine impurity 57 Dapoxetine impurity 57
Bosutinib Impurity 2 (N-Desmethyl Bosutinib) Bosutinib Impurity 2 (N-Desmethyl Bosutinib) 380843-81-2 C25H27Cl2N5O3
Peramivir Hydroxy Isomeric Impurity Peramivir Hydroxy Isomeric Impurity
Nintedanib impurity F drops Nintedanib impurity F drops
Favipiravir Impurities 1-19 Favipiravir Impurities 1-19
Ticagrelor Impurity 138X Ticagrelor Impurity 138X
Apremilast Impurity 999 Apremilast Impurity 999
Pranoprofen Impurity C Pranoprofen Impurity C
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