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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Roxithromycin h Roxithromycin h
Ixazomib Impurity 2 Ixazomib Impurity 2
sildenafil impurity I sildenafil impurity I C22H30N6O4S
2-[3-(2-cyanopropan-2-yl)-5-(1,2,4-triazol-4-ylmethyl)phenyl]-2-methyl-propaneni 2-[3-(2-cyanopropan-2-yl)-5-(1,2,4-triazol-4-ylmethyl)phenyl]-2-methyl-propaneni 120511-92-4 C17H19N5
4-(benzyloxy)-2-methyl-1H-benzo[d]imidazole-6-carboxylic acid 4-(benzyloxy)-2-methyl-1H-benzo[d]imidazole-6-carboxylic acid 942195-83-7 C16H14N2O3
Tofacitinib Impurity G Tofacitinib Impurity G
Ceftaroline Fosamil Impurity 6 Ceftaroline Fosamil Impurity 6 953037-71-3 C22H20N8O5S4
Zolmitriptan Related Compound F Zolmitriptan Related Compound F 1350928-05-0 C38H53N7O4
4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butan-1-ol 4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butan-1-ol 913614-15-0 C16H22N2OS
3-((methoxycarbonyl)methyl)-5-methylhexanoic acid 3-((methoxycarbonyl)methyl)-5-methylhexanoic acid 181289-11-2 C10H18O4
Cyanocobalamin Impurity F Cyanocobalamin Impurity F 23208-66-4 C63H85CoN13O15P
Acarbose Impurity D Acarbose Impurity D
Acarbose Impurity C Acarbose Impurity C
Nintedanib Impurity G (Intedanib Impurity G) Nintedanib Impurity G (Intedanib Impurity G)
Canagliflozin alpha-Isomer Impurity Canagliflozin alpha-Isomer Impurity
Dapagliflozin Impurity 4 Dapagliflozin Impurity 4
Isavuconazole Impurity 9 Isavuconazole Impurity 9
Apremilast Impurity E Apremilast Impurity E
Bisoprolol EP Impurity N Bisoprolol EP Impurity N 1346601-75-9 C17H29NO4
Rosuvastatin EP Impurity J Rosuvastatin EP Impurity J
Bosutinib Impurity Bosutinib Impurity 380843-12-9 C19H15Cl2N3O3
4-(4-Chloro-pyrimidin-2-ylamino)-benzamide 4-(4-Chloro-pyrimidin-2-ylamino)-benzamide 1629023-90-0 C18H12N6
Methyl 4-(4-fluorophenyl)-6-isopropyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate Methyl 4-(4-fluorophenyl)-6-isopropyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate 488798-36-3 C15H17FN2O3
Nateglinide Methyl Ester Nateglinide Methyl Ester 105746-47-2 C20H29NO3
(1S,2S,3R,5S)-3-(5-Amino-6-chloro-2-(propylthio)pyrimidin-4-ylamino)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol (1S,2S,3R,5S)-3-(5-Amino-6-chloro-2-(propylthio)pyrimidin-4-ylamino)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol 1402150-32-6 C14H23ClN4O4S
Lamivudine impurity 6 Lamivudine impurity 6 147126-64-5 C14H24O4S
Palbociclib Impurity G Palbociclib Impurity G
Trifluridine Impurity 1 Trifluridine Impurity 1
Tigecycline Impurity 1 Tigecycline Impurity 1 1138343-10-8 C29H38N5O10+
Cephalexin Impurity 3 Cephalexin Impurity 3 C16H17N3O4S
Vonoprazan Impurity 2 Vonoprazan Impurity 2
Sildenafil Impurity F Sildenafil Impurity F 263897-18-3 C21H28N6O4S
Cetirizine impurity 5 Cetirizine impurity 5 C21H25ClN2O3
Valsartan impurity 35 Valsartan impurity 35 1283097-98-2 C24H29N5O3
Valsartan Impurity 16 Valsartan Impurity 16 2680532-87-8 C7H16N2O
Istradefylline Impurity 1 Istradefylline Impurity 1
Everolimus impurity 4 Everolimus impurity 4
Ambrisentan Impurity 3 Ambrisentan Impurity 3 178306-49-5 C16H16O4
Avanafil Impurity 9 Avanafil Impurity 9
Erlotinib Imp.15 Erlotinib Imp.15
Erlotinib Imp.5 Erlotinib Imp.5
Ticagrelor Imp.Q Ticagrelor Imp.Q
Avibactam Impurity 15 Avibactam Impurity 15 1416134-60-5 C15H20N2O3
(1R,3R)-Solifenacin Succinate 2 (1R,3R)-Solifenacin Succinate 2 740780-79-4 C23H26N2O2
Daptomycin Impurity 3 Daptomycin Impurity 3
Duluvir impurity 1 Duluvir impurity 1
Lincomycin sulfoxide Impurity D Lincomycin sulfoxide Impurity D
Lornoxicam Impurity 4 Lornoxicam Impurity 4
Netupitant Impurity 3 Netupitant Impurity 3
nicergoline impurity B nicergoline impurity B
Tacrolimus Impurity B Tacrolimus Impurity B
Oxytetracycline Impurity Oxytetracycline Impurity
1H-Benz[de]isoquinolin-1-one,2,4,5,6-tetrahydro-2-[(3S)-1-oxido-1-azabicyclo[2.2.2]oct-3-yl]- 1H-Benz[de]isoquinolin-1-one,2,4,5,6-tetrahydro-2-[(3S)-1-oxido-1-azabicyclo[2.2.2]oct-3-yl]- 1021456-82-5 C19H22N2O2
Erlotinib Impurity 20 Erlotinib Impurity 20 236750-62-2 C13H20N2O5
Afatinib Impurity 17 Afatinib Impurity 17 1870880-09-3 C20H18Cl2FN5O
6-amino-1,5-dimethylpyrimidine-2,4(1H,3H)-dione 6-amino-1,5-dimethylpyrimidine-2,4(1H,3H)-dione 63959-47-7 C6H9N3O2
Ciclosporin impurity Ciclosporin impurity
Atomoxetine impurity Atomoxetine impurity 42064-62-0 C18H24ClNO
Conivaptan impurity Conivaptan impurity 1129433-63-1 C32H26N4O2
Terazosin impurity Terazosin impurity 1260939-66-9 C19H27N5O4
ent-Ivabradine Hydrochloride ent-Ivabradine Hydrochloride 167072-91-5 C27H36N2O5
SofosBuvir Impurity 2 SofosBuvir Impurity 2
isopropyl 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylate isopropyl 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylate 1346238-10-5 C19H22N2O3S
1,3-diphenylpropan-1-ol 1,3-diphenylpropan-1-ol 14097-24-6 C15H16O
Canagliflozin Impurity 21 Canagliflozin Impurity 21
Canagliflozin Impurity 7 Canagliflozin Impurity 7
Dolutegravir Glucoside Dolutegravir Glucoside
Fasudil Impurity 5 Fasudil Impurity 5 2044702-91-0 C10H9NO3S
Ibrutinib Impurity 10 Ibrutinib Impurity 10
Lesinurad Impurity 4 Lesinurad Impurity 4 1533519-97-9 C17H14BrN3O2S
1-(5-(2-fluorophenyl)-1H-pyrrol-3-yl)-N-methylmethanamine 1-(5-(2-fluorophenyl)-1H-pyrrol-3-yl)-N-methylmethanamine 1610043-62-3 C12H13FN2
FeBuxostat Impurity 26 FeBuxostat Impurity 26 1886961-39-2 C14H12N2O3S
Rivaroxaban degradation impurity 2 Rivaroxaban degradation impurity 2
(S)-methyl 2-(((S)-(perfluorophenoxy)(phenoxy)phosphoryl)amino)propanoate (S)-methyl 2-(((S)-(perfluorophenoxy)(phenoxy)phosphoryl)amino)propanoate 1911578-88-5 C16H13F5NO5P
(R)-3-((R)-2-cyclopentyl-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium (R)-3-((R)-2-cyclopentyl-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium C19H28NO3+
5-fluoro-1-((2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl)pyrimidine-2,4(1H,3H)-dione 5-fluoro-1-((2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl)pyrimidine-2,4(1H,3H)-dione C8H9FN2O4S
Amlodipine Impurity 13 Amlodipine Impurity 13 C26H31ClN2O8S
Apixaban Impurity 13 Apixaban Impurity 13
Aripiprazole-Impurity 17 Aripiprazole-Impurity 17 1424857-89-5 C16H17Cl4N3
Cefathiamidine Impurity 3 Cefathiamidine Impurity 3 1417570-09-2 C17H26N4O4S2
Rivaroxaban Impurity 34 Rivaroxaban Impurity 34
Rivaroxaban Impurity 43 Rivaroxaban Impurity 43 2197189-38-9 C19H18ClN3O6S
(S)-thiazolidine-4-carboxylic acid (D) (S)-thiazolidine-4-carboxylic acid (D) C4H7NO2S
Clindamycin 2,4-Diphosphate Clindamycin 2,4-Diphosphate 1309048-48-3 C18H35ClN2O11P2S
1-(5,6,7,8-tetrahydronaphthalen-1-yl)ethan-1-amine hydrochloride 1-(5,6,7,8-tetrahydronaphthalen-1-yl)ethan-1-amine hydrochloride 154377-56-7 C12H17N
Abiraterone Impurity 4 Abiraterone Impurity 4 2118-32-3 C23H34O2
Brexpiprazole Impurity 20 Brexpiprazole Impurity 20 1420987-85-4 C20H20N2S2
Cabozantinib Impurity D Cabozantinib Impurity D
4,9-diisobutyl-1,6-diazecane-2,7-dione 4,9-diisobutyl-1,6-diazecane-2,7-dione 1990538-03-8 C16H30N2O2
ethyl 7-chloro-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate ethyl 7-chloro-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate 75073-15-3 C12H9ClFNO3
5-phenyl-1H-pyrrole-3-carbonitrile 5-phenyl-1H-pyrrole-3-carbonitrile 122453-85-4 C11H8N2
Apixaban Impurity 42 Apixaban Impurity 42 132577-23-2 C12H14N2O4
2-METHYL-4,5-DINITRO-1H-IMIDAZOLE 2-METHYL-4,5-DINITRO-1H-IMIDAZOLE 19183-16-5 C4H4N4O4
1-Piperazineethanol, a-[(2-methoxyphenoxy)methyl]- 1-Piperazineethanol, a-[(2-methoxyphenoxy)methyl]- 162712-35-8 C14H22N2O3
2(1H)-Pyrimidinone,4-amino-1-b-D-arabinofuranosyl-, 3-oxide 2(1H)-Pyrimidinone,4-amino-1-b-D-arabinofuranosyl-, 3-oxide 30902-36-4 C9H13N3O6
3,5-Pyridinedicarboxylicacid, 4-(2-chlorophenyl)-1,4-dihydro-2,6-dimethyl-, 3,5-diethyl ester 3,5-Pyridinedicarboxylicacid, 4-(2-chlorophenyl)-1,4-dihydro-2,6-dimethyl-, 3,5-diethyl ester 34148-67-9 C19H22ClNO4
1-Propanamine,3-(dibenz[b,e]oxepin-11(6H)-ylidene)-N,N-dimethyl-, hydrochloride (1:1), (3Z)- 1-Propanamine,3-(dibenz[b,e]oxepin-11(6H)-ylidene)-N,N-dimethyl-, hydrochloride (1:1), (3Z)- 25127-31-5 C19H22ClNO
Phenol, 4-(hydroxyamino)- Phenol, 4-(hydroxyamino)- 3505-87-1 C6H7NO2
Benzoic acid, 4-(3-hydroxy-1-propenyl)-, ethyl ester Benzoic acid, 4-(3-hydroxy-1-propenyl)-, ethyl ester 89113-43-9 C12H14O3
1-((2S,3R,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl)-3-methyltetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione 1-((2S,3R,4R,5R)-3-fluoro-4-hydroxy-5-(hydroxymethyl)-3-methyltetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione 2041584-99-8 C10H13FN2O5
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