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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
24Dichloro-5methoxyacetanilide 24Dichloro-5methoxyacetanilide 65182-98-1 C9H9Cl2NO2
4,4,4-trifluoro-1-(2-methylphenyl)butane-1,3-dione 4,4,4-trifluoro-1-(2-methylphenyl)butane-1,3-dione 163266-02-2 C11H9F3O2
5-chloro-N-(4-nitrophenyl)pentanamide 5-chloro-N-(4-nitrophenyl)pentanamide 1039914-85-6 C11H13ClN2O3
N-(2,6-dimethylphenyl)piperidine-4-carboxamide N-(2,6-dimethylphenyl)piperidine-4-carboxamide 109403-19-2 C14H20N2O
5-{2-[1-(5-Hydroxy-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-4-ylidene]-ethylidene}-4-methylene-cyclohexane-1,3-diol 5-{2-[1-(5-Hydroxy-1,5-dimethyl-hexyl)-7a-methyl-octahydro-inden-4-ylidene]-ethylidene}-4-methylene-cyclohexane-1,3-diol 73837-24-8 C27H44O3
6-(4-{2-[3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 6-(4-{2-[3,5-Bis-(tert-butyl-dimethyl-silanyloxy)-2-methylene-cyclohexylidene]-ethylidene}-7a-methyl-octahydro-inden-1-yl)-2-methyl-heptan-2-ol 140710-96-9 C39H72O3Si2
(+)-Tamsulosin (+)-Tamsulosin 106138-88-9 C20H28N2O5S
2-Pyrrolidinecarboxamide,1-(hydroxyacetyl)-,(S)-(9CI) 2-Pyrrolidinecarboxamide,1-(hydroxyacetyl)-,(S)-(9CI) 96166-39-1 C7H12N2O3
1H-Pyrazole,3-ethoxy-5-methyl-1-phenyl-(9CI) 1H-Pyrazole,3-ethoxy-5-methyl-1-phenyl-(9CI) 300543-31-1 C12H14N2O
(2-PHENOXY)METHYLSULFONYLANILINE (2-PHENOXY)METHYLSULFONYLANILINE 51765-51-6 C13H13NO3S
O-phenyl N-[4-[7-[6-cyano-5-(trifluoromethyl)pyridin-3-yl]-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-5-yl]-2-fluorobenzoyl]-N-methylcarbamothioate O-phenyl N-[4-[7-[6-cyano-5-(trifluoromethyl)pyridin-3-yl]-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-5-yl]-2-fluorobenzoyl]-N-methylcarbamothioate 2894796-78-0 C28H19F4N5O3S2
5,9,13,17-Nonadecatetraen-2-one, 6,10,14,18-tetramethyl-, (Z,E,Z)- (8CI) 5,9,13,17-Nonadecatetraen-2-one, 6,10,14,18-tetramethyl-, (Z,E,Z)- (8CI) 3879-25-2 C23H38O
4-methoxy-2,3,5-trimethylpyridine 4-methoxy-2,3,5-trimethylpyridine 109371-19-9 C9H13NO
(1R,3aS,4E,7aR)-4-[(2E)-2-[(3S,5R)-3,5-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methylenecyclohexylidene]ethylidene]octahydro-7a-methyl-1-[(1R,4S)-1,4,5-trimethylhexyl]-1H-Indene (1R,3aS,4E,7aR)-4-[(2E)-2-[(3S,5R)-3,5-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methylenecyclohexylidene]ethylidene]octahydro-7a-methyl-1-[(1R,4S)-1,4,5-trimethylhexyl]-1H-Indene 2229745-37-1 C40H74O2Si2
epi-Doxycycline epi-Doxycycline 3219-99-6 C22H24N2O8
C-Desmethyl Metoprolol C-Desmethyl Metoprolol 109632-08-8 C14H23NO3
Orforglipron impurity 33 Orforglipron impurity 33
Orforglipron Impurity 40 Orforglipron Impurity 40
Bumetanide Impurity 23 Bumetanide Impurity 23
Rocuronium Bromide Impurity 34、35、36 Rocuronium Bromide Impurity 34、35、36
Vinpocetine impurity C Vinpocetine impurity C 70155-05-4 C23H28N2O3
Cloxacillin Impurity X Cloxacillin Impurity X
1-(4-((2-(4-hydroxypiperidin-1-yl)ethyl)(methyl)carbamoyl)benzyl)piperidine-4-carboxamide 1-(4-((2-(4-hydroxypiperidin-1-yl)ethyl)(methyl)carbamoyl)benzyl)piperidine-4-carboxamide
Azilsartan Impurity 107 Azilsartan Impurity 107
Perospirone Impurity 25 Perospirone Impurity 25
Paxlovid Impurity 16 Paxlovid Impurity 16
3-(2-(cyclopent-1-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide 3-(2-(cyclopent-1-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide
	Fondaparinux sodium impurity 17 Fondaparinux sodium impurity 17
Fondaparinux sodium impurity 12 Fondaparinux sodium impurity 12
Piperacillin impurity L Piperacillin impurity L
Piperacillin  Impurity X Piperacillin Impurity X
ETHYLTRITYLETHER ETHYLTRITYLETHER 968-39-8 C21H20O
Bosutinib Impurity 41 Bosutinib Impurity 41
(S)-3-Dimethylamino-3-phenylpropanol (S)-3-Dimethylamino-3-phenylpropanol 82769-75-3 C11H17NO
Valdecoxib N-Oxide Valdecoxib N-Oxide
Olodaterol Impurity 23 Olodaterol Impurity 23
	Miglitol Isomer impurities C Miglitol Isomer impurities C
Alpha-D-Methylglucoside Alpha-D-Methylglucoside
6-(3-CHLOROPHENYL)-1,3,5-TRIAZINE-2,4-DIAMINE 6-(3-CHLOROPHENYL)-1,3,5-TRIAZINE-2,4-DIAMINE 4514-54-9 C9H8ClN5
α-Methyl-3,4-dihydroxy-L-phenylalanine methyl ester α-Methyl-3,4-dihydroxy-L-phenylalanine methyl ester 18181-08-3 C11H15NO4
(6R,7R)-3-Chloromethyl-7-methoxy-8-oxo-7-(p-toluoylamino)-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester (6R,7R)-3-Chloromethyl-7-methoxy-8-oxo-7-(p-toluoylamino)-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester 68314-38-5 C30H27ClN2O6
Methyl a-formylphenylacetate Methyl a-formylphenylacetate 5894-79-1 C10H10O3
1-Butanesulfonic acid methyl ester 1-Butanesulfonic acid methyl ester 2374-69-8 C5H12O3S
D-(-)-3-Acetylthio-2-methylpropionic acid D-(-)-3-Acetylthio-2-methylpropionic acid 76497-39-7 C6H10O3S
OLANEXIDINE OLANEXIDINE 146510-36-3 C17H27Cl2N5
1-(2-ETHOXY-ETHYL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 1-(2-ETHOXY-ETHYL)-1,3-DIHYDRO-BENZOIMIDAZOL-2-ONE 101953-61-1 C11H14N2O2
3-Cyano-4-(2-methylpropoxy)benzenecarbothioamide 3-Cyano-4-(2-methylpropoxy)benzenecarbothioamide 163597-57-7 C12H14N2OS
1-BOC-4-(2-AMINO-4-PYRIDINYL)-PIPERAZINE 1-BOC-4-(2-AMINO-4-PYRIDINYL)-PIPERAZINE 571189-23-6 C14H22N4O2
1,3,5,7-Tetranitroadamantane 1,3,5,7-Tetranitroadamantane 75476-36-7 C10H12N4O8
Fexofenadinone Fexofenadinone 76811-98-8 C32H37NO4
2’-Deschloro-2’-hydroxy Dasatinib 2’-Deschloro-2’-hydroxy Dasatinib 1159977-25-9 C22H27N7O3S
Cefoselis Impurity 1 Cefoselis Impurity 1 2630910-59-5 C19H22N8O6S2
3-chloro-5-((1-((4-ethyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridin-3-yl)oxy)benzonitrile 3-chloro-5-((1-((4-ethyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridin-3-yl)oxy)benzonitrile 1338225-98-1 C18H13ClF3N5O3
tert-butyl (4-(4-(3-chloroazetidin-1-yl)piperidin-1-yl)-2-methoxy-5- nitrophenyl)carbamate tert-butyl (4-(4-(3-chloroazetidin-1-yl)piperidin-1-yl)-2-methoxy-5- nitrophenyl)carbamate
Sugammadex sodium Org199129-1 Impurity Sugammadex sodium Org199129-1 Impurity
Sugammadex sodium Impurity 41 Sugammadex sodium Impurity 41
Apixaban Impurity 51 Apixaban Impurity 51 1620494-29-2 C33H32N4O5
4-(5-methyl-2-phenyloxazol-4-yl)benzenesulfonamide 4-(5-methyl-2-phenyloxazol-4-yl)benzenesulfonamide 2242749-01-3 C16H14N2O3S
Cefazolin Impurity EP-I Cefazolin Impurity EP-I
Cabozantinib impurity 42 Cabozantinib impurity 42
Cabozantinib impurity 55 Cabozantinib impurity 55
Canagliflozin Impurity 68 Canagliflozin Impurity 68
Dapoxetine impurity 51 Dapoxetine impurity 51
Doxofylline Impurity 20 Doxofylline Impurity 20
Dapoxetine impurity 64 Dapoxetine impurity 64
Dapoxetine impurity 58 Dapoxetine impurity 58
ethyl (R)-thiazolidine-4-carboxylate ethyl (R)-thiazolidine-4-carboxylate 60664-15-5 C6H11NO2S
3-((3R,4R)-3-(7H-[4,7'-bipyrrolo[2,3-d]pyrimidin]-4'-yl(methyl) amino)-4-methylpiperidin-1-yl)-3-oxopropanenitrile		3-((3R,4R)-3-(7H-[4,7'-bipyrrolo[2,3-d]pyrimidin]-4'-yl(methyl) amino)-4-methylpiperidin-1-yl)-3-oxopropanenitrile 2504210-48-2 C22H23N9O
Faropenem Impurity D Faropenem Impurity D
[2S-(2alpha,5alpha,6alpha)]-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid [2S-(2alpha,5alpha,6alpha)]-6-bromo-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 24138-28-1 C8H10BrNO3S
5-nitro-2-furaldehyde (5-nitrofurfurylene)hydrazone 5-nitro-2-furaldehyde (5-nitrofurfurylene)hydrazone 736-53-8 C10H6N4O6
4-(benzo[b]thiophen-4-yl)-1,1-bis(4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butyl)piperazin-1-ium chloride 4-(benzo[b]thiophen-4-yl)-1,1-bis(4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butyl)piperazin-1-ium chloride 2454317-16-7 C38H41N4O4S
methyl (R)-thiazolidine-4-carboxylate methyl (R)-thiazolidine-4-carboxylate 42258-90-2 C5H9NO2S
Revefenacin Impurity 7 Revefenacin Impurity 7 1158777-54-8 C14H19ClN2O3
(R)-8-(3-aminopiperidin-1-yl)-3-methyl-1,7-bis((4-methylquinazolin-2-yl)methyl)-3,7-dihydro-1H-purine-2,6-dione (R)-8-(3-aminopiperidin-1-yl)-3-methyl-1,7-bis((4-methylquinazolin-2-yl)methyl)-3,7-dihydro-1H-purine-2,6-dione
Oxytocin Impurity 8 Trifluoroacetate Oxytocin Impurity 8 Trifluoroacetate
Peramivir Dehydrated Impurity Peramivir Dehydrated Impurity
Apixaban Impurity 78 Apixaban Impurity 78
Formoterol Impurity 32 Formoterol Impurity 32
(1S,2S,3R,4R)-2-((R)-1-acetamido-2-ethylbutyl)-4-guanidino-3-hydroxycyclopentane-1-carboxylic acid (1S,2S,3R,4R)-2-((R)-1-acetamido-2-ethylbutyl)-4-guanidino-3-hydroxycyclopentane-1-carboxylic acid
Desloratadine EP impurity A hcl Desloratadine EP impurity A hcl 2250242-44-3 C19H21Cl2FN2
(R)-6-(2-((1S,2S)-2,6-dimethyl-1,2,3,4-tetrahydronaphthalen-1-yl) ethyl)-5,6-dihydro-2H-pyran-2-one and (R)-6-(2-((R)-2,6-dimethyl- 5,6,7,8-tetrahydronaphthalen-1-yl)ethyl)-5,6-dihydro-2H-pyran-2-one (R)-6-(2-((1S,2S)-2,6-dimethyl-1,2,3,4-tetrahydronaphthalen-1-yl) ethyl)-5,6-dihydro-2H-pyran-2-one and (R)-6-(2-((R)-2,6-dimethyl- 5,6,7,8-tetrahydronaphthalen-1-yl)ethyl)-5,6-dihydro-2H-pyran-2-one
(3S,4S)-Tofacitinib (3S,4S)-Tofacitinib 1092578-47-6 C16H20N6O
Rosuvastatin Impurity 145 Rosuvastatin Impurity 145
Apixaban Impurities 15 Complete Set Apixaban Impurities 15 Complete Set
Peramivir Intermediate impurity 1 Peramivir Intermediate impurity 1
Rosuvastatin EP Impurity G Rosuvastatin EP Impurity G
Peramivir Intermediate Impurity 43 Peramivir Intermediate Impurity 43
Peramivir Deacetylated Impurity Peramivir Deacetylated Impurity
Linagliptin Impurity 49 Linagliptin Impurity 49
Loxoprofen Sodium Impurity 35 Loxoprofen Sodium Impurity 35
Dashatinib impurity 46 Dashatinib impurity 46
(R,S)-N-Acetyl-3,4-dimethoxy phenylalanine (R,S)-N-Acetyl-3,4-dimethoxy phenylalanine 27313-65-1 C13H17NO5
Oxytocin oxide impurity reference substance Oxytocin oxide impurity reference substance
Troxipide Impurity 7 Troxipide Impurity 7
Bendamustine Impurity 37A Bendamustine Impurity 37A
Brivaracetam Impurity 50 Brivaracetam Impurity 50
4-Desacetyl Vincristine 4-Desacetyl Vincristine 3704-01-6 C44H54N4O9
	Relugolix Impurity 91 Relugolix Impurity 91
D,L N-Desmethylvenlafaxine D,L N-Desmethylvenlafaxine 149289-30-5 C16H25NO2
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