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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Phenacetin Impurity 3 Phenacetin Impurity 3 24176-84-9 C14H13ClN2O2
2-(isopropylamino)-3-(4-(2-methoxyethyl)phenoxy)propan-1-ol 2-(isopropylamino)-3-(4-(2-methoxyethyl)phenoxy)propan-1-ol 109632-11-3 C15H25NO3
Pabuxilibu impurities Pabuxilibu impurities
ERYTHROMYCIN IMPURITY G ERYTHROMYCIN IMPURITY G
Amylmetacresol EP impurity E Amylmetacresol EP impurity E
(2S)-2-(2,5-dioxo-3-propylpyrrolidin-1-yl)butanamide (2S)-2-(2,5-dioxo-3-propylpyrrolidin-1-yl)butanamide 2232201-72-6 C11H18N2O3
methyl 1-hydroxy-2-oxoindoline-6-carboxylate methyl 1-hydroxy-2-oxoindoline-6-carboxylate 1895918-24-7 C10H9NO4
Dapagliflozin Impurity (MW: 437Da) Dapagliflozin Impurity (MW: 437Da)
Cetirizine Impurity BHA Cetirizine Impurity BHA
Macitentandesbromopyrimidine Impurity Macitentandesbromopyrimidine Impurity
Cilastatin EP Impurity H Cilastatin EP Impurity H
Febuxostat Impurity 130 Febuxostat Impurity 130 1643131-93-4 C20H25NO5S
(2-Chlorophenyl)diphenylmethanol (2-Chlorophenyl)diphenylmethanol
Nilotinib Impurity 27 Nilotinib Impurity 27 1807606-80-9 C28H22F3N7O2
Vonoprazan Impurity 53 Vonoprazan Impurity 53
Vonoprazan Impurity 61 Vonoprazan Impurity 61
Emtricitabine Ring-opening Impurity Emtricitabine Ring-opening Impurity
Tafluprost Impurity 1 (Tafluprost (1S,2S,3S,5R)-Isomer) Tafluprost Impurity 1 (Tafluprost (1S,2S,3S,5R)-Isomer)
Escitalopram Butyryl Impurity Escitalopram Butyryl Impurity 1803244-58-7 C25H33FN2O2
Oseltamivir isomer impurity Oseltamivir isomer impurity
Ethyl 4-bromo-3-hydroxybutyrate Ethyl 4-bromo-3-hydroxybutyrate 32224-01-4 C6H11BrO3
4-(2,3-DIMETHYL-BENZYL)-1H-IMIDAZOLE HCL H2O 4-(2,3-DIMETHYL-BENZYL)-1H-IMIDAZOLE HCL H2O 90038-00-9 C12H17ClN2O
(2S,3S,5S)-2-Hexyl-3,5-dihydroxyhexadecanoic Acid (2S,3S,5S)-2-Hexyl-3,5-dihydroxyhexadecanoic Acid 130793-30-5 C22H44O4
(1,2,4-Triazol-4-yl) Itraconazole (1,2,4-Triazol-4-yl) Itraconazole 854372-77-3 C35H38Cl2N8O4
6,7,8,9-Tetrahydro Carvedilol 6,7,8,9-Tetrahydro Carvedilol 1246820-73-4 C24H30N2O4
Cefdinir Lactone Cefdinir Lactone 946573-41-7 C14H13N5O5S2
Ozagrel methylester Ozagrel methylester 866157-50-8 C13H12N2O2
2-Propanol, 1-[2-(2-methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]- 2-Propanol, 1-[2-(2-methoxyethyl)phenoxy]-3-[(1-methylethyl)amino]- 163685-38-9 C15H25NO3
2-aMino-3-Methyl-3-sulfino-4-(1H-1,2,3-triazol-1-yl)butyric acid 2-aMino-3-Methyl-3-sulfino-4-(1H-1,2,3-triazol-1-yl)butyric acid 118175-11-4 C7H12N4O4S
1,4,8,11-Tetraazacy clotetradecance, 1,4,8-tris[(4 Methylphenyl)sufonyl]- 1,4,8,11-Tetraazacy clotetradecance, 1,4,8-tris[(4 Methylphenyl)sufonyl]- 104395-69-9 C31H42N4O6S3
(1S)-N-(3S)-1-Azabicyclo[2.2.2]oct-3-yl-1,2,3,4-tetrahydro-1-naphthalenecarboxaMide (1S)-N-(3S)-1-Azabicyclo[2.2.2]oct-3-yl-1,2,3,4-tetrahydro-1-naphthalenecarboxaMide 177793-79-2 C18H24N2O
5-BroModescyano CitalopraM 5-BroModescyano CitalopraM 64169-39-7 C19H21BrFNO
Aripiprazole N,N-Dioxide Aripiprazole N,N-Dioxide 573691-13-1 C23H27Cl2N3O4
Deschloro Cetirizine Dihydrochloride Deschloro Cetirizine Dihydrochloride 83881-54-3 C21H26N2O3
DesvancosaMinyl VancoMycin DesvancosaMinyl VancoMycin 101485-50-1 C59H62Cl2N8O22
rac N-Desbutyroyl Acebutolol rac N-Desbutyroyl Acebutolol 57898-80-3 C14H22N2O3
rac-Clopidogrel-MP Endo Derivative rac-Clopidogrel-MP Endo Derivative 1346598-12-6 C25H26ClNO6S
1,1'-N-[Methylenebis(sulphanediylethylene)]bis(N'-Methyl-2-nitroethene-1,1-diaMine 1,1'-N-[Methylenebis(sulphanediylethylene)]bis(N'-Methyl-2-nitroethene-1,1-diaMine 1331637-48-9 C11H22N6O4S2
ent-LaMivudine ent-LaMivudine 134680-32-3 C8H11N3O3S
Formoterol O-β-D-Glucuronide Formoterol O-β-D-Glucuronide 615551-59-2 C25H32N2O10
Mono-POC Tenofovir 6-Isopropyl CarbaMate Mono-POC Tenofovir 6-Isopropyl CarbaMate 1244022-56-7 C18H28N5O9P
N-Methyl Iso Desloratadine N-Methyl Iso Desloratadine 183198-48-3 C20H21ClN2
Tartaric Acid Isopropyl Ester Tartaric Acid Isopropyl Ester 116601-09-3 C7H12O6
Vardenafil Acetyl Analogue Vardenafil Acetyl Analogue 1261351-28-3 C25H34N6O3
fenofibrate iMpurity fenofibrate iMpurity
6,11-Di-O-Methyl ErythroMycin 6,11-Di-O-Methyl ErythroMycin 81103-14-2 C39H71NO13
ent-OseltaMivir Phosphate ent-OseltaMivir Phosphate 1035895-89-6 C16H29N2O8P
3,5,3',5'-Tetraiodo Thyrolactic Acid 3,5,3',5'-Tetraiodo Thyrolactic Acid 7069-47-8 C15H10I4O5
3-cyano-4-isobutoxybenzaMide 3-cyano-4-isobutoxybenzaMide 161718-85-0 C12H14N2O2
Caffeidinecarboxylic acid Caffeidinecarboxylic acid 54536-15-1 C8H12N4O3
1-Keto BaMbuterol 1-Keto BaMbuterol 112935-94-1 C18H27N3O5
7-Chloro-4-(4-hydroxyanilino)quinoline 7-Chloro-4-(4-hydroxyanilino)quinoline 81099-86-7 C15H11ClN2O
Desfluoro EzetiMibe Desfluoro EzetiMibe 302781-98-2 C24H22FNO3
5-(2-Bromo-1-oxobutyl)-8-hydroxy-2(1H)-quinolinone 5-(2-Bromo-1-oxobutyl)-8-hydroxy-2(1H)-quinolinone 59827-93-9 C13H12BrNO3
Oseltamivir Impurity 105 Oseltamivir Impurity 105
Oseltamivir Impurity 77 Oseltamivir Impurity 77
Imidapril Impurity 2 Imidapril Impurity 2
Betamethasone EP Impurity G Betamethasone EP Impurity G 85700-75-0 C22H30O5
Benazepril Related Compound F Benazepril Related Compound F
1,5-Benzothiazepin-4(5H)-one, 3-(acetyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-, (2S-trans)- 1,5-Benzothiazepin-4(5H)-one, 3-(acetyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-2-(4-methoxyphenyl)-, (2S-trans)- 111188-70-6 C22H26N2O4S
1H-Benzimidazole-2-sulfinicacid(9CI) 1H-Benzimidazole-2-sulfinicacid(9CI) 58536-71-3 C7H6N2O2S
1(3H)-Isobenzofuranone,3-methyl-(9CI) 1(3H)-Isobenzofuranone,3-methyl-(9CI) 3453-64-3 C9H8O2
3-ETHOXY-4-METHOXYBENZOIC ACID 3-ETHOXY-4-METHOXYBENZOIC ACID 2651-55-0 C10H12O4
4-hydroxyurapidil 4-hydroxyurapidil 88733-12-4 C20H29N5O4
2-chloro-4-nitrophenyl-N-acetylglucosaminide 2-chloro-4-nitrophenyl-N-acetylglucosaminide 103614-82-0 C14H17ClN2O8
desisopropylprocaterol desisopropylprocaterol 63483-95-4 C13H16N2O3
10-bromocarbamazepine 10-bromocarbamazepine 59690-97-0 C15H11BrN2O
ethyl apovincaminate ethyl apovincaminate 42971-12-0 C22H26N2O2
ALS 8123 ALS 8123 81148-15-4 C15H23NO4
Ro 14-7437 Ro 14-7437 78756-03-3 C15H15N3O3
4-(2-Cyanophenyl)benzaldehyde 4-(2-Cyanophenyl)benzaldehyde 135689-93-9 C14H9NO
4-[(2,3-Dihydro-5,6-dimethoxy-1H-inden-2-yl)methyl]-1-(phenylmethyl)piperidine Hydrochloride 4-[(2,3-Dihydro-5,6-dimethoxy-1H-inden-2-yl)methyl]-1-(phenylmethyl)piperidine Hydrochloride 1034439-57-0 C24H32ClNO2
5-(aminosulfonyl)-2-methoxybenzamide 5-(aminosulfonyl)-2-methoxybenzamide 52395-25-2 C8H10N2O4S
PIPERIDINE-3-CARBOXYLIC ACID (2,6-DIMETHYL-PHENYL)-AMIDE PIPERIDINE-3-CARBOXYLIC ACID (2,6-DIMETHYL-PHENYL)-AMIDE 337488-90-1 C14H20N2O
N-Desmethyl Citalopram-d4 Oxalate N-Desmethyl Citalopram-d4 Oxalate 62498-68-4 C21H21FN2O5
2-Ethoxy-6-nitro-9-acridinamine 2-Ethoxy-6-nitro-9-acridinamine 20304-70-5 C15H13N3O3
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
(E)-Ceftriaxone (E)-Ceftriaxone 92143-31-2 C18H18N8O7S3
(Z)-Cinnarizine (Z)-Cinnarizine 750512-44-8 C26H28N2
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