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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
ButanaMide, 4-hydroxy-N-(1-Methylethyl)- ButanaMide, 4-hydroxy-N-(1-Methylethyl)- 42042-66-0 C7H15NO2
5H-chroMeno[2,3-b]pyridin-7-ylacetic acid 5H-chroMeno[2,3-b]pyridin-7-ylacetic acid 52549-07-2 C14H11NO3
IMp. B (EP): (2RS,4S)-2-[[[[3-(2-Chloro-6-fluorophenyl)-5-Methylisoxazol-4-yl]carbonyl]aMino]Methyl]-5,5-diMethyl- thiazolidine-4-carboxylic Acid (Penilloic Acids of Flucloxacillin) IMp. B (EP): (2RS,4S)-2-[[[[3-(2-Chloro-6-fluorophenyl)-5-Methylisoxazol-4-yl]carbonyl]aMino]Methyl]-5,5-diMethyl- thiazolidine-4-carboxylic Acid (Penilloic Acids of Flucloxacillin)
IMp. C (EP): (4-(DiphenylMethyl)-1,1-bis[(E)-3-phenylprop-2-enyl]piperaziniuM Chloride IMp. C (EP): (4-(DiphenylMethyl)-1,1-bis[(E)-3-phenylprop-2-enyl]piperaziniuM Chloride 95062-18-3 C35H35ClF2N2
IMp. E (EP): 4-AMino-5-(ethylsulphonyl)-2-Methoxybenzoic Acid IMp. E (EP): 4-AMino-5-(ethylsulphonyl)-2-Methoxybenzoic Acid
3,5-DiMethyl-1-nitroadaMantane 3,5-DiMethyl-1-nitroadaMantane 6588-68-7 C12H19NO2
2-Deschloro Aripiprazole 2-Deschloro Aripiprazole 203395-82-8 C23H28ClN3O2
6-O-Benzyl-4-dehydroxy-4-diMethylphenylsilyl Entecavir 6-O-Benzyl-4-dehydroxy-4-diMethylphenylsilyl Entecavir 649761-24-0 C27H31N5O2Si
Desisobutyl-n-butyl BortezoMib Desisobutyl-n-butyl BortezoMib 1104011-35-9 C19H25BN4O4
2-aMino-4-Methoxy-5-(3-Morpholinopropoxy)benzaMide 2-aMino-4-Methoxy-5-(3-Morpholinopropoxy)benzaMide 246512-44-7 C15H23N3O4
N-(4,6-dichloro-2-(propylthio)pyriMidin-5-yl)forMaMide N-(4,6-dichloro-2-(propylthio)pyriMidin-5-yl)forMaMide 1402150-28-0 C8H9Cl2N3OS
Ebastine IMpurity G Ebastine IMpurity G 1429071-65-7 C32H39NO3
((R)-3-Methyl-1-((R)-3-phenyl-2-(pyrazine-2-carboxaMido)propanaMido)butyl)boronic acid ((R)-3-Methyl-1-((R)-3-phenyl-2-(pyrazine-2-carboxaMido)propanaMido)butyl)boronic acid 1132709-15-9 C19H25BN4O4
(S)-N-(1-AMino-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxaMide (S)-N-(1-AMino-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxaMide 289472-80-6 C14H14N4O2
(3aS,4R,6S,6aR)-6-AMinotetrahydro-2,2-diMethyl-4H-cyclopenta-1,3-dioxol-4-ol (3aS,4R,6S,6aR)-6-AMinotetrahydro-2,2-diMethyl-4H-cyclopenta-1,3-dioxol-4-ol 592533-90-9 C8H15NO3
(4R,6S)-tert-Butyl-6-cyanoMethyl-2,2-diMethyl-1,3-dioxane-4-acetate (4R,6S)-tert-Butyl-6-cyanoMethyl-2,2-diMethyl-1,3-dioxane-4-acetate 196085-84-4 C14H23NO4
(1R,2R,3S,5R)-3-(7-((1S,2R)-2-(3,4-difluorophenyl)cyclopropylaMino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol (1R,2R,3S,5R)-3-(7-((1S,2R)-2-(3,4-difluorophenyl)cyclopropylaMino)-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol 2096989-55-6 C23H28F2N6O4S
Rivaroxaban iMpurity Rivaroxaban iMpurity 1616563-62-2 C15H17N3O5
AMoxicillin iMpurity K AMoxicillin iMpurity K C16H19N3O5S
cefoxitin iMpurity D cefoxitin iMpurity D
3-Morpholinone, 4-(2,4-diaMinophenyl)- 3-Morpholinone, 4-(2,4-diaMinophenyl)- 482308-13-4 C10H13N3O2
BenzenesulfonaMide, N-[1,6-dihydro-5-(2-Methoxyphenoxy)-6-oxo[2,2'-bipyriMidin]-4-yl]-4-(1,1-diMethylethyl)- BenzenesulfonaMide, N-[1,6-dihydro-5-(2-Methoxyphenoxy)-6-oxo[2,2'-bipyriMidin]-4-yl]-4-(1,1-diMethylethyl)- 174227-14-6 C25H25N5O5S
BenzaMide, N-[1-(3,5-di-O-benzoyl-2-C-Methyl-β-D-arabinofuranosyl)-1,2-dihydro-2-oxo-4-pyriMidinyl]- BenzaMide, N-[1-(3,5-di-O-benzoyl-2-C-Methyl-β-D-arabinofuranosyl)-1,2-dihydro-2-oxo-4-pyriMidinyl]- 863329-62-8 C31H27N3O8
Fosfluconazole iMpurity Fosfluconazole iMpurity
Cinacalcet Impurity D Cinacalcet Impurity D 1271930-15-4 C32H31F6N
AtracuriuM IMpurity D2 (cis-Quaternary Alcohol) AtracuriuM IMpurity D2 (cis-Quaternary Alcohol) 1100676-16-1 C35H47NO10S
AzithroMycin IMpurity O AzithroMycin IMpurity O
BendaMustine Dihydroxy IMpurity BendaMustine Dihydroxy IMpurity 109882-29-3 C16H24ClN3O4
BroMocriptine IMpurity G BroMocriptine IMpurity G C32H40BrN5O5
Captopril IMpurity H Captopril IMpurity H 205521-07-9 C15H23NO5S2
Cefdinir IMpurity 3 (Cefdinir Decarboxy Open Ring Lactone (Mixture of A and B)) Cefdinir IMpurity 3 (Cefdinir Decarboxy Open Ring Lactone (Mixture of A and B)) 178949-04-7 C13H15N5O4S2
Ceftriaxone IMpurit D Ceftriaxone IMpurit D
Ciprofloxacin Related CoMpound Ciprofloxacin Related CoMpound 528851-30-1 C15H17Cl2N3O3
Dasatinib IMpurity 4 Dasatinib IMpurity 4
Deferasirox Methyl Ester Deferasirox Methyl Ester 1266741-05-2 C22H17N3O4
Deltacortinene Acetate (Predisolone Acetate IMpurity) Deltacortinene Acetate (Predisolone Acetate IMpurity) 4380-55-6 C23H28O5
Entecavir IMpurity A Entecavir IMpurity A
Fasudil IMpurity 1 Fasudil IMpurity 1 1423155-03-6 C14H17N3O2S
Irbesartan IMpurity Irbesartan IMpurity 1079997-01-5 C26H30N6O2
Montelukast EP IMpurity I Montelukast EP IMpurity I
RaceMic Fudosteine HCl RaceMic Fudosteine HCl 1023971-15-4 C6H13NO3S
RocuroniuM BroMide IMpurity 18 RocuroniuM BroMide IMpurity 18
SalMeterol IMpurity E SalMeterol IMpurity E C25H37NO4
SulbactaM IMpurity C SulbactaM IMpurity C
Terazosin IMpurity J Terazosin IMpurity J 152551-75-2 C19H27N5O4
Ticarcillin SodiuM IMpurity A Ticarcillin SodiuM IMpurity A 36041-93-7 C14H16N2O4S2
R-afatinib R-afatinib 945553-91-3 C24H25ClFN5O3
EthanediaMide iMpurity E EthanediaMide iMpurity E C2H4N2O2
Methyl (1-benzyl-4-Methylpiperidin-3-yl)carbaMate Methyl (1-benzyl-4-Methylpiperidin-3-yl)carbaMate 1206875-41-3 C15H22N2O2
S-(-)-[1-(3-Methoxyphenyl)ethyl]-N,N-diMethylaMine S-(-)-[1-(3-Methoxyphenyl)ethyl]-N,N-diMethylaMine 889443-69-0 C11H17NO
N-(4-aMinophenyl)-2-chloro-N-MethylacetaMide N-(4-aMinophenyl)-2-chloro-N-MethylacetaMide 855860-75-2 C9H11ClN2O
Ibrutinib iMpurity Ibrutinib iMpurity 936351-48-3 C12H13ClN2O
1-Phenyl-5-(pyridin-2-yl)-1,2-dihydropyridin-2-one 1-Phenyl-5-(pyridin-2-yl)-1,2-dihydropyridin-2-one 381725-50-4 C16H12N2O
Abacavir Impurity E Abacavir Impurity E 208762-35-0 C14H20N6O
5-(5-Chlorosulfonyl-2-ethoxyphenyl)-3-propyl-1,6-dihydro_x000b_-7H-pyrazolo[4,3-d]pyrimidin-7-one 5-(5-Chlorosulfonyl-2-ethoxyphenyl)-3-propyl-1,6-dihydro_x000b_-7H-pyrazolo[4,3-d]pyrimidin-7-one 139756-31-3 C16H17ClN4O4S
5,7-difluorochroman-4-one 5,7-difluorochroman-4-one 844648-22-2 C9H6F2O2
(3R,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic acid (3R,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic acid 769908-13-6 C25H24FNO4
(7a,17b)-7-7-[9-[(4,4,5,5,5-Pentafluoropentyl)sulfinyl]nonyl]-estra-1,3,5(10)-triene-3,17-diol 17-acetate (7a,17b)-7-7-[9-[(4,4,5,5,5-Pentafluoropentyl)sulfinyl]nonyl]-estra-1,3,5(10)-triene-3,17-diol 17-acetate 261506-24-5 C34H49F5O4S
1-(1H-benzo[d]imidazol-2-yl)-3-methyl-4-oxo-1,4-dihydropyridine-2-carboxylic acid 1-(1H-benzo[d]imidazol-2-yl)-3-methyl-4-oxo-1,4-dihydropyridine-2-carboxylic acid 1163685-30-0 C14H11N3O3
O-Desethyl Candesartan Cilexetil O-Desethyl Candesartan Cilexetil 869631-11-8 C31H30N6O6
α-Desmethyl Anastrozole α-Desmethyl Anastrozole 1215780-15-6 C16H17N5
Epi Lovastatin Epi Lovastatin 79952-44-6 C24H36O5
Hydroxy Brimonidine Hydroxy Brimonidine 1216379-05-3 C11H12BrN5O
7-Methoxy-3,4-dihydro-1H-quinolin-2-one 7-Methoxy-3,4-dihydro-1H-quinolin-2-one 22246-17-9 C10H11NO2
4-Methoxy-alpha-methyl-N-(phenylmethyl)benzeneethanamine hydrochloride 4-Methoxy-alpha-methyl-N-(phenylmethyl)benzeneethanamine hydrochloride 1049695-95-5 C17H21NO.HCl
Montelukast Methyl Ketone Montelukast Methyl Ketone 937275-23-5 C34H32ClNO3S
Propyl Itraconazole Propyl Itraconazole 74855-91-7 C34H36Cl2N8O4
3-methyleneisobenzofuran-1(3H)-one 3-methyleneisobenzofuran-1(3H)-one 3453-63-2 C9H6O2
Irbesartan impurity A Irbesartan impurity A C25H28N6O
(1R,5S,6R)-rel-5-(1-Ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Ethyl Ester (1R,5S,6R)-rel-5-(1-Ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-3-carboxylic Acid Ethyl Ester 347378-74-9 C14H22O4
(3R,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic Acid CalciuM Salt (3R,5R,6E)-7-[2-Cyclopropyl-4-(4-fluorophenyl)-3-quinolinyl]-3,5-dihydroxy-6-heptenoic Acid CalciuM Salt 254452-96-5 C25H24FNO4
(αZ)-α-(MethoxyiMino)-N-[(5aR,6R)-1,4,5a,6-tetrahydro-1,7-dioxo-3H,7H-azeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl]-2-furanacetaMide (αZ)-α-(MethoxyiMino)-N-[(5aR,6R)-1,4,5a,6-tetrahydro-1,7-dioxo-3H,7H-azeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl]-2-furanacetaMide 947723-87-7 C15H13N3O6S
1-[[2-[(2-AMinophenyl)aMino]-5-Methyl-3-thienyl]carbonyl]-4-Methyl-piperazine 1-[[2-[(2-AMinophenyl)aMino]-5-Methyl-3-thienyl]carbonyl]-4-Methyl-piperazine 138564-61-1 C17H22N4OS
1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-hydroxy-4-oxo-3-quinolinecarboxylic Acid Ethyl Ester 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-hydroxy-4-oxo-3-quinolinecarboxylic Acid Ethyl Ester 452092-31-8 C15H13F2NO4
2-(IsopropylaMino)-2',6'-acetoxylidide Hydrochloride 2-(IsopropylaMino)-2',6'-acetoxylidide Hydrochloride 35891-87-3 C13H21ClN2O
2,2'-IMinobis(N-(2,6-DiMethylphenyl)acetiaMide Hydrochloride 2,2'-IMinobis(N-(2,6-DiMethylphenyl)acetiaMide Hydrochloride 1135231-62-7 C20H26ClN3O2
3,4-O-(DiethylMethylidene) ShikiMic Acid Ethyl Ester 3,4-O-(DiethylMethylidene) ShikiMic Acid Ethyl Ester 943515-58-0 C14H22O5
4-Hydroxy-α1-[[[6-(2-phenylethoxy)hexyl]aMino]Methyl]-1,3-benzenediMethanol 4-Hydroxy-α1-[[[6-(2-phenylethoxy)hexyl]aMino]Methyl]-1,3-benzenediMethanol 94749-02-7 C23H33NO4
5-[2-Ethoxy-5-[(4-Methyl-1-piperazinyl)thioxoMethyl]phenyl]-1,6-dihydro-1-Methyl-3-propyl-7H-pyrazolo[4,3-d]pyriMidine-7-thione 5-[2-Ethoxy-5-[(4-Methyl-1-piperazinyl)thioxoMethyl]phenyl]-1,6-dihydro-1-Methyl-3-propyl-7H-pyrazolo[4,3-d]pyriMidine-7-thione 1333233-46-7 C23H30N6OS2
BIRG 613 BS BIRG 613 BS 287980-85-2 C15H16N4O
Deferasirox Salicyloyl Ester Deferasirox Salicyloyl Ester 1395346-28-7 C28H19N3O6
N-2-Hydroxy-3-[[2-(Methoxyphenoxy)ethyl]aMine Carvedilol N-2-Hydroxy-3-[[2-(Methoxyphenoxy)ethyl]aMine Carvedilol 1198090-73-1 C36H43N3O7
Ticagrelor IMpurity B Ticagrelor IMpurity B
AtracuriuM IMpurity V AtracuriuM IMpurity V 1075726-86-1 C25H34INO6
Avanafil iMpurity 3 Avanafil iMpurity 3
CitalopraM carboxylic acid iMpurity CitalopraM carboxylic acid iMpurity 440121-09-5 C20H22FNO3
Decitabine iMpurity 6 Decitabine iMpurity 6 178671-74-4 C7H14N4O4
DiazepaM IMpurity E DiazepaM IMpurity E 20927-53-1 C15H11ClN2O
ErtapeneM Side Chain EnantioMer 2 HCl ErtapeneM Side Chain EnantioMer 2 HCl 503607-49-6 C12H15ClN2O3S
Ribavirin IMpurity G Ribavirin IMpurity G
Ethanone, 1-(2,5-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)- 1-(2,5-Difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone,1-(2,5-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone Ethanone, 1-(2,5-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)- 1-(2,5-Difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone,1-(2,5-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone 1157938-97-0 C10H7F2N3O
3-Fluoro-4-phenylphenol 3-Fluoro-4-phenylphenol 477860-13-2 C12H9FO
Heptyl Deoctyl FingoliMod Hydrochloride Heptyl Deoctyl FingoliMod Hydrochloride 162361-44-6 C18H32ClNO2
4-Methoxy-3,5-diMethylpyridine 1-Oxide 4-Methoxy-3,5-diMethylpyridine 1-Oxide 91219-89-5 C8H11NO2
N-Ethyl-3-buteno-o-toluidide N-Ethyl-3-buteno-o-toluidide 13936-71-5 C13H17NO
Pramipexole Impurity 21 Pramipexole Impurity 21 104617-86-9 C10H17N3S
Tigecycline Pentacyclic Analog Tigecycline Pentacyclic Analog 1268494-40-1 C27H32N4O9
Tigecycline (open C-ring D-ring) Quinone Tigecycline (open C-ring D-ring) Quinone 1268494-46-7 C26H32N4O8
5-Chloro AcesulfaMe 5-Chloro AcesulfaMe 72827-08-8 C4H4ClNO4S
Pazopanib iMpurity Pazopanib iMpurity
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