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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
4-O-Carboxymethyl-21-deoxy-20-hydroxy-21-oxorifamycin 4-O-Carboxymethyl-21-deoxy-20-hydroxy-21-oxorifamycin 15271-73-5 C39H47NO15
(3,4-Dimethoxyphenyl)isopropyl ketone (3,4-Dimethoxyphenyl)isopropyl ketone 14046-55-0 C12H16O3
2,3-Dichloro-5,6-diphenylpyrazine 2,3-Dichloro-5,6-diphenylpyrazine 57038-62-7 C16H10Cl2N2
DIDESMETHYL CITALOPRAM-D4 DIDESMETHYL CITALOPRAM-D4 62498-69-5 C18H17FN2O
Bis(3-hydroxypropyl) persulfide Bis(3-hydroxypropyl) persulfide 30453-21-5 C6H14O2S2
CHLOROAC-PRO-OH CHLOROAC-PRO-OH 23500-10-9 C7H10ClNO3
2,4-Dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-2-(1-methylpropyl)-3H-1,2,4-triazol-3-one 2,4-Dihydro-4-[4-[4-(4-methoxyphenyl)-1-piperazinyl]phenyl]-2-(1-methylpropyl)-3H-1,2,4-triazol-3-one 252964-68-4 C23H29N5O2
2-(2-Methoxyphenoxy)ethanol 2-(2-Methoxyphenoxy)ethanol 18181-71-0 C9H12O3
2-(3-Chloro-2-hydroxypropyl)-2H-isoindole-1,3-dione 2-(3-Chloro-2-hydroxypropyl)-2H-isoindole-1,3-dione 19667-37-9 C11H10ClNO3
4,6-Dibromo-m-cresol 4,6-Dibromo-m-cresol 13321-76-1 C7H6Br2O
Metoprolol Acid Ethyl Ester Metoprolol Acid Ethyl Ester 29112-40-1 C16H25NO4
6-Hydroxy Desloratadine 6-Hydroxy Desloratadine 119410-05-8 C19H19ClN2O
10-Acetyloxy Oxcarbazepine 10-Acetyloxy Oxcarbazepine 113952-21-9 C17H14N2O4
9-[[2-(α-L-Alanyloxy)ethoxy]methyl]guanine Hydrochloride 9-[[2-(α-L-Alanyloxy)ethoxy]methyl]guanine Hydrochloride 84499-63-8 C11H17ClN6O4
Irinotecan Impurity 26 Irinotecan Impurity 26 86639-51-2 C22H20N2O5
Bis(aminoethoxy) Amlodipine Bis(aminoethoxy) Amlodipine 721958-74-3 C22H30ClN3O6
7,8,9,10-Dehydro Doxorubicinone 7,8,9,10-Dehydro Doxorubicinone 1159977-23-7 C21H14O8
4-tert-Butyl-2,6-dimethyl-3-hydroxyphenylacetamide (Oxymetazoline hydrochloride impurity) 4-tert-Butyl-2,6-dimethyl-3-hydroxyphenylacetamide (Oxymetazoline hydrochloride impurity) 55699-13-3 C14H21NO2
(S)-N-Demethyl Dapoxetine (S)-N-Demethyl Dapoxetine 147199-39-1 C20H21NO
Famotidine Related Compound A Hydrochloride Famotidine Related Compound A Hydrochloride 76833-47-1 C8H15ClN6S2
Des(trifluoroethyl) Lansoprazole Sulfide Des(trifluoroethyl) Lansoprazole Sulfide 131926-97-1 C14H13N3OS
Desulfo Aztreonam Desulfo Aztreonam 102579-59-9 C13H17N5O5S
Mosapride Citric Amide Mosapride Citric Amide 1215825-20-9 C27H31ClFN3O9
Ribavirin Related Compound A (15 mg) (1-beta-D-ribofuranosyl-1H-1,2,4-triazole-3-carboxylic acid) Ribavirin Related Compound A (15 mg) (1-beta-D-ribofuranosyl-1H-1,2,4-triazole-3-carboxylic acid) 39925-19-4 C8H11N3O6
3-(3-TRIFLUOROMETHYL-PHENYL)-PROPYLAMINE 3-(3-TRIFLUOROMETHYL-PHENYL)-PROPYLAMINE 104774-87-0 C10H12F3N
4-(3,4-Dichloro-phenyl)-3,4-dihydro-2H-naphthalen-1-one 4-(3,4-Dichloro-phenyl)-3,4-dihydro-2H-naphthalen-1-one 124379-29-9 C16H12Cl2O
(4-(2-(azepan-1-yl)ethoxy)phenyl)Methanol (4-(2-(azepan-1-yl)ethoxy)phenyl)Methanol 223251-16-9 C15H23NO2
4-HYDROXY PROPOFOL 4-HYDROXY PROPOFOL 1988-10-9 C12H18O2
(1R,2R)-2-(3,4-difluorophenyl)cyclopropanecarboxylic acid (1R,2R)-2-(3,4-difluorophenyl)cyclopropanecarboxylic acid 220352-36-3 C10H8F2O2
2-Thiopheneacetic acid, α-hydroxy-α-2-thienyl-, (3R)-1-azabicyclo[2.2.2]oct-3-yl ester 2-Thiopheneacetic acid, α-hydroxy-α-2-thienyl-, (3R)-1-azabicyclo[2.2.2]oct-3-yl ester 320347-97-5 C17H19NO3S2
benzbroMarone iMpurity benzbroMarone iMpurity
Dasatinib iMpurity Dasatinib iMpurity 1184919-23-0 C22H27N7O2S
eszopiclone iMpurity eszopiclone iMpurity
IMidafenacin iMpurity IMidafenacin iMpurity 503599-41-5 C18H20N2O2
latanoprost iMpurity latanoprost iMpurity 733036-95-8 C25H35FO5
Irbesartan IMpurity D Irbesartan IMpurity D C25H28N6O
Ondansetron HCl IMpurity-G Ondansetron HCl IMpurity-G 99614-03-6 C17H17N3O
lithiuM 2-(4-(Methylsulfonyl)phenyl)acetate lithiuM 2-(4-(Methylsulfonyl)phenyl)acetate 1421227-96-4 C9H11LiO4S
Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetaMide) Anastrozole IMpurity (3-(1-Cyano-1-Methylethyl)-alfa,alfa-diMethyl-5-(1H-,1,2,4-triazole-1-ylMethyl)-benzeneacetaMide) 120512-03-0 C17H21N5O
AtracuriuM IMpurity I (Mixture of cis, trans(I1), cis, cis(I2), tans, trans IsoMer) AtracuriuM IMpurity I (Mixture of cis, trans(I1), cis, cis(I2), tans, trans IsoMer)
1-((2R,3R)-2-(benzyloxy)pentan-3-yl)-4-(4-(4-(4-hydroxyphenyl)piperazin-1-yl)phenyl)-1H-1,2,4-triazol-5(4H)-one 1-((2R,3R)-2-(benzyloxy)pentan-3-yl)-4-(4-(4-(4-hydroxyphenyl)piperazin-1-yl)phenyl)-1H-1,2,4-triazol-5(4H)-one 2243786-01-6 C30H35N5O3
5-(3-fluorophenyl)-1H-pyrrole-3-carbaldehyde 5-(3-fluorophenyl)-1H-pyrrole-3-carbaldehyde C11H8FNO
1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic acid bis(1-methylethyl) ester 1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic acid bis(1-methylethyl) ester 21881-78-7 C21H26N2O6
2-(4-Methylphenyl)sulfonyloxyethanol 2-(4-Methylphenyl)sulfonyloxyethanol 42772-85-0 C9H12O4S
2-Azabicyclo[3.1.0]hexane-3-carbonitrile, 2-[(2S)-2-aMino-2-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)acetyl]-, (1R,3R,5R)- 2-Azabicyclo[3.1.0]hexane-3-carbonitrile, 2-[(2S)-2-aMino-2-(3-hydroxytricyclo[3.3.1.13,7]dec-1-yl)acetyl]-, (1R,3R,5R)- 1564265-94-6 C18H25N3O2
EMpagliflozin iMpurity 8 EMpagliflozin iMpurity 8
EMpagliflozin iMpurity 13 EMpagliflozin iMpurity 13 2125472-55-9 C23H25ClO8
6-Methyldi(ondansetron-3-de(1,2-diMethyl-1H-iMidazole)) 6-Methyldi(ondansetron-3-de(1,2-diMethyl-1H-iMidazole)) 1365727-07-6 C27H26N2O2
(-)-Syringaresinol-4-O-beta-D-glucopyranoside (-)-Syringaresinol-4-O-beta-D-glucopyranoside 137038-13-2 C28H36O13
Budesonide Impurity (1, 4-Androstadien-11-beta-16-alfa-diol-3, 17-dione) Budesonide Impurity (1, 4-Androstadien-11-beta-16-alfa-diol-3, 17-dione) 910299-74-0 C19H24O4
Etoricoxib Impurity 12 Etoricoxib Impurity 12 646459-41-8 C21H16ClN3O2S
Levofloxacin Tetrafluoro Impurity 2 Levofloxacin Tetrafluoro Impurity 2 103995-33-1 C14H12F4O4
Mupirocin Impurity C Mupirocin Impurity C C26H44O9
(S)-3-Methyl-1-(2-piperidin-1-ylphenyl)butylamine (S)-3-Methyl-1-(2-piperidin-1-ylphenyl)butylamine 147769-93-5 C16H26N2
Ceftriaxone IMpurit C Ceftriaxone IMpurit C
Flucloxacillin IMpurity G Flucloxacillin IMpurity G
Gefitinib N-Oxide Gefitinib N-Oxide 847949-51-3 C22H24ClFN4O4
Milrinone IMpurity 3 Milrinone IMpurity 3 98293-81-3 C12H7N3O3
Nicardipine Related CoMpound 4 Nicardipine Related CoMpound 4 123973-71-7 C25H27N3O6
PraMipexole IMp.BI-II786BS PraMipexole IMp.BI-II786BS
Propofol IMpurity E Propofol IMpurity E
Solifenacin Related CoMpound 5 Solifenacin Related CoMpound 5
TelMisartan BroMo Ethyl Ester TelMisartan BroMo Ethyl Ester 133085-87-7 C16H15BrO2
Tolterodine Lactol IMpurity Tolterodine Lactol IMpurity 209747-04-6 C16H16O2
Valsartan N1-Trityl IMpurity Valsartan N1-Trityl IMpurity
(3-Carbamoylallyl)trimethylammonium (3-Carbamoylallyl)trimethylammonium 857162-57-3 C7H15N2O+
3-CHLORO-4-HYDROXYACETANILIDE 3-CHLORO-4-HYDROXYACETANILIDE 3964-54-3 C8H8ClNO2
Apixaban IMpurity(BMS-591329-01) Apixaban IMpurity(BMS-591329-01)
ent-14S-3-Methoxy-17-MethylMorphinan ent-14S-3-Methoxy-17-MethylMorphinan 1453167-99-1 C18H25NO
PD 224378 PD 224378 501665-88-9 C20H35NO11
(rac,syn)-4-Deschloro-sertraline (rac,syn)-4-Deschloro-sertraline 871838-58-3 C17H18ClN
1-[2-(DiMethylaMino)-1-phenylethyl]cyclohexanol 1-[2-(DiMethylaMino)-1-phenylethyl]cyclohexanol 93413-86-6 C16H25NO
1-[4-(2-Methoxyethenyl)phenoxy]-3-[(1-Methylethyl)aMino]-2-propanol 1-[4-(2-Methoxyethenyl)phenoxy]-3-[(1-Methylethyl)aMino]-2-propanol 82961-02-2 C15H23NO3
11-Desethyl Irinotecan 11-Desethyl Irinotecan 103816-16-6 C31H34N4O6
5-Methoxy-2-[[(4-Methoxy-3,5-diMethyl-2-pyridinyl)Methyl]thio]-1H-benziMidazole N-Oxide 5-Methoxy-2-[[(4-Methoxy-3,5-diMethyl-2-pyridinyl)Methyl]thio]-1H-benziMidazole N-Oxide 142885-92-5 C17H19N3O3S
7-[[[(CyanoMethyl)thio]acetyl]aMino]-7-Methoxy Cephalosporanic Acid 7-[[[(CyanoMethyl)thio]acetyl]aMino]-7-Methoxy Cephalosporanic Acid 56796-16-8 C15H17N3O7S2
7S-Cefdinir 7S-Cefdinir 178601-89-3 C14H13N5O5S2
Dehydroxy BroMocelecoxib Dehydroxy BroMocelecoxib 170570-75-9 C17H13BrF3N3O2S
Desethylene Norfloxacin Hydrochloride Desethylene Norfloxacin Hydrochloride 75001-77-3 C14H16FN3O3
p-(2,3-Epoxypropoxy)benzyl Alcohol p-(2,3-Epoxypropoxy)benzyl Alcohol 4204-78-8 C10H12O3
α-Etoposide α-Etoposide 100007-53-2 C29H32O13
N-Desmethyl-N-benzyl Sildenafil N-Desmethyl-N-benzyl Sildenafil 1446089-82-2 C28H34N6O4S
4-Hydroxy AtoMoxetine Oxalate 4-Hydroxy AtoMoxetine Oxalate 457634-21-8 C19H23NO6
6-Chloro-1-Ethyl-4-Oxo-7-(Piperazin-1-yl)-1,4-Dihydroquinoline-3-Carboxylic acid 6-Chloro-1-Ethyl-4-Oxo-7-(Piperazin-1-yl)-1,4-Dihydroquinoline-3-Carboxylic acid 67681-84-9 C16H18ClN3O3
Afatinib IMpurity J Afatinib IMpurity J 1456696-14-2 C18H22N4O4
Aprepitant iMpurity A Aprepitant iMpurity A
Atorvastatin LactaM Phenanthrene CalciuM Salt Atorvastatin LactaM Phenanthrene CalciuM Salt 1046378-58-8 C33H35CaFN2O6
Avanafil IMpurity 7 Avanafil IMpurity 7
Desfluoro flurbiprofen axetil Desfluoro flurbiprofen axetil 1685278-08-3 C19H20O4
Desloratadine IMpurity 6 Desloratadine IMpurity 6 38092-90-9 C20H21ClN2
ErtapeneM Ring Open IMpurity ErtapeneM Ring Open IMpurity
LincoMycin iMpurity C LincoMycin iMpurity C
Verapamil Impurity H Verapamil Impurity H 67018-83-1 C26H36N2O4
Warfarin Impurity 1 Warfarin Impurity 1 55901-61-6 C13H14O
Vitexin -4''-O-glucoside Vitexin -4''-O-glucoside 178468-00-3 C27H30O15
Aripiprazole EP impurity D Aripiprazole EP impurity D
Macitentan impurity B Macitentan impurity B 441796-13-0 C18H18Br2N6O4S
Meropenem IMP B Meropenem IMP B
tert-butyl 4-(6-bromopyridin-3-yl)piperazine-1-carboxylate tert-butyl 4-(6-bromopyridin-3-yl)piperazine-1-carboxylate 412348-27-7 C14H20BrN3O2
ETHYL 3,4-EPOXYBUTANOATE ETHYL 3,4-EPOXYBUTANOATE 32223-97-5 C6H10O3
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