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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
2,2'-Binaphthalene-6,6'-dicarboxylic Acid 2,2'-Binaphthalene-6,6'-dicarboxylic Acid 932033-58-4 C22H14O4
OXOLINIC ACID IMPURITY B OXOLINIC ACID IMPURITY B 16172-03-5 C15H15NO5
DESETHYLENE CIPROFLOXACIN, HYDROCHLORIDE DESETHYLENE CIPROFLOXACIN, HYDROCHLORIDE 528851-31-2 C15H16FN3O3.ClH
[2-(3-pyridinyl)ethylidene-1,1]bis(phosphonic acid) [2-(3-pyridinyl)ethylidene-1,1]bis(phosphonic acid) 75755-10-1 C7H11NO6P2
Atorvastatin Related Compound C Atorvastatin Related Compound C 693793-53-2 C33H36CaF2N2O5
benazepril hydrochloride benazepril hydrochloride 215447-89-5 C24H28N2O5HCl
L-Nateglinide L-Nateglinide 105816-05-5 C19H27NO3
INDAPAMIDE RELATED COMPOUND A (50 MG) (4-CHLORO-N-(2-METHYL-INDOL-1-YL)-3-SULFAMOYLBEN-ZAMIDE) (AS) INDAPAMIDE RELATED COMPOUND A (50 MG) (4-CHLORO-N-(2-METHYL-INDOL-1-YL)-3-SULFAMOYLBEN-ZAMIDE) (AS) 63968-75-2 C16H14ClN3O3S
OXYBUTYNIN IMPURITY A OXYBUTYNIN IMPURITY A 1199574-71-4 C22H35NO3
PHENYTOIN RELATED COMPOUND B (50 MG) (AL-PHA-((AMINOCARBONYL)AMINO)-ALPHA-PHENYL BEN-ZENEACETIC ACID) PHENYTOIN RELATED COMPOUND B (50 MG) (AL-PHA-((AMINOCARBONYL)AMINO)-ALPHA-PHENYL BEN-ZENEACETIC ACID) 6802-95-5 C15H14N2O3
1-[3-(4-tert-Butylbenzoyl)propyl]-4-hydroxypiperidine 1-[3-(4-tert-Butylbenzoyl)propyl]-4-hydroxypiperidine 97928-18-2 C19H29NO2
(1S–4R)-4-(2-amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol hydrochloride (1S–4R)-4-(2-amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol hydrochloride 172015-79-1 C11H12ClN5O.ClH
cis-Tranylcypromine hydrochloride cis-Tranylcypromine hydrochloride 54779-58-7 C9H12ClN
BETAMETHASONE BENZOATE (200 MG) BETAMETHASONE BENZOATE (200 MG) 22298-29-9 C35H41FO8
TIZANIDINE RELATED COMPOUND B (50 MG) (N-ACETYLTIZANIDINE) TIZANIDINE RELATED COMPOUND B (50 MG) (N-ACETYLTIZANIDINE) 173532-15-5 C11H10ClN5OS
DESETHYL CHLOROQUINE DESETHYL CHLOROQUINE 1476-52-4 C16H22ClN3
rac 1-Chloro-3-[4-(2-methoxyethyl)phenoxy]-2-propanol rac 1-Chloro-3-[4-(2-methoxyethyl)phenoxy]-2-propanol 56718-76-4 C12H17ClO3
17R-Drospirenone 17R-Drospirenone 90457-65-1 C24H30O3
HALOPERIDOL RELATED COMPOUND A (15 MG) (4,4'-BIS[(4-P-CHLOROPHENYL)-4-HYDROXY-PIPERIDINO]-BU-TYROPHENONE) HALOPERIDOL RELATED COMPOUND A (15 MG) (4,4'-BIS[(4-P-CHLOROPHENYL)-4-HYDROXY-PIPERIDINO]-BU-TYROPHENONE) 67987-08-0 C32H36Cl2N2O3
5-Amino-2,4,6-triiodo-N-methylisophthalamic Acid 5-Amino-2,4,6-triiodo-N-methylisophthalamic Acid 2280-89-9 C9H7I3N2O3
Dehydronitrendipine Dehydronitrendipine 89267-41-4 C18H18N2O6
4-Benzyl Albuterol 4-Benzyl Albuterol 56796-66-8 C20H27NO3
cephaeline hydrochloride cephaeline hydrochloride 5853-29-2 C28H39ClN2O4
Coenzyme Coenzyme 45127-11-5 C4H10O6S4
7-AMINO-3-[(Z)-PROP-1-ENYL]-3-CEPHEM-4-CARBOXYLIC ACID 7-AMINO-3-[(Z)-PROP-1-ENYL]-3-CEPHEM-4-CARBOXYLIC ACID 106447-44-3 C10H12N2O3S
2,6-Diisopropyl-1,4-benzoquinone 2,6-Diisopropyl-1,4-benzoquinone 1988-11-0 C12H16O2
(R)-(-)-Repaglinide (Repaglinide Impurity) (R)-(-)-Repaglinide (Repaglinide Impurity) 147852-26-4 C27H36N2O4
Gemfibrozil Related Compound A ,(E,Z)-2,2-dimethyl-5-[2,5-dimethyl-4-(propene-1-yl)phenoxy]valeric acid Gemfibrozil Related Compound A ,(E,Z)-2,2-dimethyl-5-[2,5-dimethyl-4-(propene-1-yl)phenoxy]valeric acid 500904-61-0 C18H26O3
Atorvastatin Related Compound A Atorvastatin Related Compound A 433289-83-9 C33H35CaN2O5+
4-DesMethyl-3-Methyl Celecoxib 4-DesMethyl-3-Methyl Celecoxib 170570-01-1 C17H14F3N3O2S
eicosapentaenoic acid ethyl ester eicosapentaenoic acid ethyl ester 73310-10-8 C22H34O2
CLEBOPRIDE MALATE CLEBOPRIDE MALATE 57645-91-7 C23H28ClN3O6
1-(3-Chlorophenyl)-1-hydroxy-2-propanone 1-(3-Chlorophenyl)-1-hydroxy-2-propanone 857233-13-7 C9H9ClO2
3S, 5S enantioMer of Atorvastatin CalciuM 3S, 5S enantioMer of Atorvastatin CalciuM 1105067-88-6 C33H34CaFN2O5+
SalMeterol Xinafoate Adduct IMpurity SalMeterol Xinafoate Adduct IMpurity 1330076-52-2 C36H43NO6
Telmisartan Related Compound B (15 mg) (4'-[(1,7'-dimethyl-2'-propyl-1H,1'H-2,5'-bibenzo[d]imidazol-1'-yl)methyl]biphenyl-2-carboxylic acid) Telmisartan Related Compound B (15 mg) (4'-[(1,7'-dimethyl-2'-propyl-1H,1'H-2,5'-bibenzo[d]imidazol-1'-yl)methyl]biphenyl-2-carboxylic acid) 1026353-20-7 C33H30N4O2
EPOXIDIZED LINSEED OIL EPOXIDIZED LINSEED OIL 8016-11-3
LEVODOPA RELATED COMPOUND A (50 MG) (3-(3,4,6-TRIHYDROXYPHENYL)-ALANINE) LEVODOPA RELATED COMPOUND A (50 MG) (3-(3,4,6-TRIHYDROXYPHENYL)-ALANINE) 27244-64-0 C9H11NO5
3-Nitro-4-phenoxy-5-sulfaMoylbenzoic Acid 3-Nitro-4-phenoxy-5-sulfaMoylbenzoic Acid 28328-53-2 C13H10N2O7S
ALLOPURINOL IMPURITY C ALLOPURINOL IMPURITY C 1346604-13-4 C6H6N6O
PEAK E PEAK E 132685-02-0 C24H26N4O4
CHLORCYCLIZINE HYDROCHLORIDE CHLORCYCLIZINE HYDROCHLORIDE 14362-31-3 C18H22Cl2N2
1-[4-(2-Hydroxyethyl)phenoxy]-2,3-epoxypropane 1-[4-(2-Hydroxyethyl)phenoxy]-2,3-epoxypropane 63659-17-6 C15H20O3
Almagate Almagate 66827-12-1 CH6AlMgO4(-3)
Loperamide Loperamide 106900-12-3 C29H33ClN2O3
L-Glutamic acid, N-[4-[[ (2-amino-1, 4-dihydro-4-oxo-6-pteridinyl)meth yl]methylamino]benzoyl]- L-Glutamic acid, N-[4-[[ (2-amino-1, 4-dihydro-4-oxo-6-pteridinyl)meth yl]methylamino]benzoyl]- 2410-93-7 C20H21N7O6
2-(Acetylsulfanyl)ethanesulphonic 2-(Acetylsulfanyl)ethanesulphonic 69536-71-6 C4H8O4S2
Albuterol Aldehyde Albuterol Aldehyde 156339-88-7 C13H19NO3
4-phenylbutylphosphonic acid 4-phenylbutylphosphonic acid 46348-61-2 C10H15O3P
Trandolapril Related Compound D (25 mg) ((S)-ethyl 2-[(3S, 5aS, 9aR, 10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]-4-phenylbutanoate) Trandolapril Related Compound D (25 mg) ((S)-ethyl 2-[(3S, 5aS, 9aR, 10aS)-3-methyl-1,4-dioxodecahydropyrazino[1,2-a]indol-2(1H)-yl]-4-phenylbutanoate) 149881-40-3 C24H32N2O4
Benzoic acid, 2-(hexahydro-1-Methyl-1H-azepin-4-yl)hydrazide Benzoic acid, 2-(hexahydro-1-Methyl-1H-azepin-4-yl)hydrazide 110406-94-5 C14H21N3O
D-PENICILLAMINE DISULFIDE D-PENICILLAMINE DISULFIDE 20902-45-8 C10H20N2O4S2
HIDE POWDER HIDE POWDER
9,11-Didehydroestriol 9,11-Didehydroestriol 246021-20-5 C18H22O3
Gabapentin Related Compound D Gabapentin Related Compound D 1076198-17-8 C18H29NO3
Vardenafil hydrochloride trihydrate Vardenafil hydrochloride trihydrate 330808-88-3 C23H35ClN6O5S
Norglipin Norglipin 16444-19-2 C21H23NO3
4-[Methyl[(2-amino-4-hydroxypteridine)-6-ylmethyl]amino]benzoic acid 4-[Methyl[(2-amino-4-hydroxypteridine)-6-ylmethyl]amino]benzoic acid 5623-18-7 C15H14N6O3
2-(3-CARBOXYPHENYL)PROPIONIC ACID 2-(3-CARBOXYPHENYL)PROPIONIC ACID 68432-95-1 C10H10O4
rac 5-Desfluoro Voriconazole rac 5-Desfluoro Voriconazole 182369-73-9 C16H15F2N5O
3-Oxo Ziprasidone (Ziprasidone Impurity B) 3-Oxo Ziprasidone (Ziprasidone Impurity B) 1159977-56-6 C21H19ClN4O2S
Desfluoro Risperidone Desfluoro Risperidone 106266-09-5 C23H28N4O2
Des(2,3-dihydroxypropyl) Iodixanol Des(2,3-dihydroxypropyl) Iodixanol 255376-57-9 C32H38I6N6O13
DAUNOMYCINONE DAUNOMYCINONE 21794-55-8 C21H18O8
Duloxetine IMpurity A Duloxetine IMpurity A 947686-09-1 C25H23NO3S
Labetalol IMpurity A Labetalol IMpurity A 1391051-99-2 C19H23NO4
Cetirizine Ethyl Ester (USP RC A) Cetirizine Ethyl Ester (USP RC A) 246870-46-2 C23H29ClN2O3
6,6'-DiMethoxy-2,2'-binaphthalene 6,6'-DiMethoxy-2,2'-binaphthalene 29619-45-2 C22H18O2
FLUCONAZOLE RELATED COMPOUND B (10 MG) (2-(4-FLUOROPHENYL)-1,3-BIS(1 H-1,2,4-TRIAZOL-1 -YL)-PROPAN-2-OL) FLUCONAZOLE RELATED COMPOUND B (10 MG) (2-(4-FLUOROPHENYL)-1,3-BIS(1 H-1,2,4-TRIAZOL-1 -YL)-PROPAN-2-OL) 81886-51-3 C13H13FN6O
LEVOCARNITINE RELATED COMPOUND A (100 MG) (3-CARBOXY-N,N,N-TRIMETHYL-2-PROPEN-1-AMINIUM CHLORIDE) LEVOCARNITINE RELATED COMPOUND A (100 MG) (3-CARBOXY-N,N,N-TRIMETHYL-2-PROPEN-1-AMINIUM CHLORIDE) 6538-82-5 C7H13ClNO2
Levomepromazine hydrochloride Levomepromazine hydrochloride 1236-99-3 C19H24N2OS.ClH
Prednisolone 21-trimethylacetate Prednisolone 21-trimethylacetate 1107-99-9 C26H36O6
octahydro-2-nitrosocyclopenta[c]pyrrole octahydro-2-nitrosocyclopenta[c]pyrrole 54786-86-6 C7H12N2O
Clazuril Clazuril 101831-36-1 C17H10Cl2N4O2
Citalopram Related Compound E Citalopram Related Compound E
1-Cyano-3-isopropylguanidine 1-Cyano-3-isopropylguanidine 44830-55-9 C5H10N4
C00984 C00984 3646-73-9 C6H12O6
LevetiracetaM IMpurity B LevetiracetaM IMpurity B 358629-47-7 C8H12N2O2
Aripiprazole N1-Oxide Aripiprazole N1-Oxide 573691-09-5 C23H27Cl2N3O3
N-De(4-sulfonaMidophenyl)-N'-(4-sulfonaMidophenyl) Celecoxib N-De(4-sulfonaMidophenyl)-N'-(4-sulfonaMidophenyl) Celecoxib 331943-04-5 C17H14F3N3O2S
Tioconazole Related Compound A (25 mg) (1-[2,4-Dichloro-beta-[(3-thenyl)-oxy]phenethyl]imidazole hydrochloride) Tioconazole Related Compound A (25 mg) (1-[2,4-Dichloro-beta-[(3-thenyl)-oxy]phenethyl]imidazole hydrochloride) 61709-33-9 C16H15Cl3N2OS
5-[2-Ethoxy-5-[(4-Methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-Methyl-3-(2-Methylpropyl)-7H-pyrazolo[4,3-d]pyriMidin-7-one 5-[2-Ethoxy-5-[(4-Methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-Methyl-3-(2-Methylpropyl)-7H-pyrazolo[4,3-d]pyriMidin-7-one 1391053-95-4 C23H32N6O4S
Loratadine EP IMpurity F Loratadine EP IMpurity F 125743-80-8 C22H24ClFN2O2
N-[[(HEXAHYDROCYCLOPENTA [C]PYRROL-2(1H)-YL)AMINO]CARBONYL]-2-METHYL BENZENESULFONAMIDE N-[[(HEXAHYDROCYCLOPENTA [C]PYRROL-2(1H)-YL)AMINO]CARBONYL]-2-METHYL BENZENESULFONAMIDE 1076198-18-9 C15H21N3O3S
GLIMEPIRIDE RELATED COMPOUND C (20 MG) (GLIMEPIRIDE URETHANE) GLIMEPIRIDE RELATED COMPOUND C (20 MG) (GLIMEPIRIDE URETHANE) 119018-30-3 C18H23N3O6S
INSULIN LISPRO (5.97 MG) INSULIN LISPRO (5.97 MG) 133107-64-9 C257H383N65O77S6
TRAMADOL IMPURITY E TRAMADOL IMPURITY E C16H25NO2
FLUCONAZOLE IMPURITY B FLUCONAZOLE IMPURITY B C13H12F2N6O
OXITROPIUM BROMIDE OXITROPIUM BROMIDE 30286-75-0 C19H26BrNO4
ChlorproMazine Sulfoxide ChlorproMazine Sulfoxide 969-99-3 C17H19ClN2OS
Fosinopril Related Compound B Fosinopril Related Compound B
4-Nitro-2-phenoxyaniline 4-Nitro-2-phenoxyaniline 5422-92-4 C12H10N2O3
SulfaMethoxazole N4-glucoside SulfaMethoxazole N4-glucoside 119691-75-7 C16H21N3O8S
6-O-METHYLCODEINE 6-O-METHYLCODEINE 2859-16-7 C19H23NO3
Prednisolone tebutate Prednisolone tebutate 7681-14-3 C27H38O6
ACETOPHENAZINE MALEATE (200 MG) ACETOPHENAZINE MALEATE (200 MG) 5714-00-1 C53H64N6O11S2
apovincamine apovincamine 4880-92-6 C21H24N2O2
4-cyclohexyl-alpha-methylnaphthalene-1-acetic acid 4-cyclohexyl-alpha-methylnaphthalene-1-acetic acid 71109-09-6 C19H22O2
4'-(pyrimidin-2-ylsulphamoyl)acetanilide 4'-(pyrimidin-2-ylsulphamoyl)acetanilide 127-74-2 C12H12N4O3S
1H-Imidazol-5-amine,1-methyl-4-nitro-(9CI) 1H-Imidazol-5-amine,1-methyl-4-nitro-(9CI) 4531-54-8 C4H6N4O2
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