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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Axitinib Impurity 17 Axitinib Impurity 17
Erlotinib Impurity 37 Erlotinib Impurity 37
Bis{2-[benzyl(methyl)amino]ethyl} 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate dihydrochloride Bis{2-[benzyl(methyl)amino]ethyl} 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate dihydrochloride 71784-27-5 C35H41ClN4O6
3-amino-6-chloro-2-methyl-4-phenylquinazolin-4-ol 3-amino-6-chloro-2-methyl-4-phenylquinazolin-4-ol 27537-87-7 C15H14ClN3O
Riluzole 5-Trifluoromethoxy Isomer Riluzole 5-Trifluoromethoxy Isomer 752969-85-0 C8H5F3N2OS
Pazufloxacin Impurity 7 Pazufloxacin Impurity 7 171567-48-9 C15H15FN2O3
Empagliflozin Impurity 42 Empagliflozin Impurity 42
2-amino-2-(4-nonylphenethyl)propane-1,3-diol 2-amino-2-(4-nonylphenethyl)propane-1,3-diol 746594-44-5 C20H35NO2
Zopiclone Impurity 17 Zopiclone Impurity 17
Pregabalin Impurity D Pregabalin Impurity D 53439-96-6 C11H14O3
Cephalosporin Impurity 3 HCl Cephalosporin Impurity 3 HCl 2429-86-9 C14H17N3O6S
((2R,3S,4R,5R,6S)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl) methyl)-4-methylphenyl)-3,4,5-trihydroxytetrahydro- 2H-pyran-2-yl)methyl acetate ((2R,3S,4R,5R,6S)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl) methyl)-4-methylphenyl)-3,4,5-trihydroxytetrahydro- 2H-pyran-2-yl)methyl acetate 2146135-87-5 C26H27FO6S
Atracurium Impurity 5 Atracurium Impurity 5
Cefazolin Impurity 1 Cefazolin Impurity 1
Tofacitinib Impurity 77 Tofacitinib Impurity 77 1640971-51-2 C16H20N6O2
Tofacitinib Impurity 84 Tofacitinib Impurity 84
De(carboxymethoxy) Cetirizine Acetic Acid Dihydrochloride De(carboxymethoxy) Cetirizine Acetic Acid Dihydrochloride 1000690-91-4 C19H22Cl2N2O2
7-Despropyl 7-Methyl Vardenafil 7-Despropyl 7-Methyl Vardenafil 2169247-39-4 C21H28N6O4S
Apixaban Impurity 32 Apixaban Impurity 32
Apremilast Impurity 20 Apremilast Impurity 20
Bendamustine Impurity 36 Bendamustine Impurity 36
Bosutinib Impurity 7 Bosutinib Impurity 7 219786-51-3 C10H12BrNO4
Cefazolin Impurity 13 Cefazolin Impurity 13
Cefoxitin Impurity 4 Cefoxitin Impurity 4
Cilnidipine Impurity 3 Cilnidipine Impurity 3 123853-41-8 C24H22N2O6
Erlotinib Impurity 50 Erlotinib Impurity 50
Pitavastatin Impurity 26 Pitavastatin Impurity 26
Plerixafor Impurity 2 Plerixafor Impurity 2
Pregabalin Impurity 48 Pregabalin Impurity 48 1239856-83-7 C11H23NO2
Rivaroxaban Impurity 76 Rivaroxaban Impurity 76
Rocuronium bromide Impurity 36 Rocuronium bromide Impurity 36
Sildenafil Impurity 14 Sildenafil Impurity 14 2146091-79-2 C24H32N6OS2
Telmisartan Impurity 6 Telmisartan Impurity 6 1083158-65-9 C19H22N4O
Apremilast Impurity CNA Apremilast Impurity CNA
Atracurium Impurity Q Atracurium Impurity Q
Atracurium Impurity W Atracurium Impurity W
AZD9291(Osimertinib) Impurity 5 AZD9291(Osimertinib) Impurity 5
Azilsartan impurity Y Azilsartan impurity Y
Celecoxib Impurity 15 Celecoxib Impurity 15 C17H14F3N3O2S
Etoposide Impurity 2 Etoposide Impurity 2
Fludarabine EP impurity J Fludarabine EP impurity J
Ropivacaine Impurity 12 Ropivacaine Impurity 12
Solifenacin impurity 17 Solifenacin impurity 17 1029430-94-1 C19H17N3O
Sugammadex sodium Org205485-1 Impurity Sugammadex sodium Org205485-1 Impurity
Sugammadex sodium Org246653-1 Impurity Sugammadex sodium Org246653-1 Impurity
Tadalafil impurity R Tadalafil impurity R
N-((4-(5-(p-tolyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)phenyl) sulfonyl)acetamide N-((4-(5-(p-tolyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)phenyl) sulfonyl)acetamide 198471-47-5 C19H16F3N3O3S
Afatinib impurity 35 Afatinib impurity 35
Avibactam Impurity 40 Avibactam Impurity 40 2089462-89-3 C15H20N2O3
Butyphthalide impurity 29 Butyphthalide impurity 29
Butyphthalide impurity 38 Butyphthalide impurity 38 1841089-56-2 C24H30O5
Canagliflozin Impurity 39 Canagliflozin Impurity 39
Cefaclor double bond displacement impurity 9 Cefaclor double bond displacement impurity 9
Diquafosol Impurity 7 Diquafosol Impurity 7
Febuxostat Impurity 75 Febuxostat Impurity 75
Febuxostat Impurity 90 Febuxostat Impurity 90 2646683-37-4
Febuxostat Impurity 95 Febuxostat Impurity 95
Ibrutinib Impurity 17 Ibrutinib Impurity 17 2134109-10-5 C16H18N6O
LCZ696(valsartan + sacubitril) impurity 36 LCZ696(valsartan + sacubitril) impurity 36
Lenvatinib Impurity 17 Lenvatinib Impurity 17
Moxifloxacin degradation impurity 36 Moxifloxacin degradation impurity 36
Moxifloxacin Impurity 49 Moxifloxacin Impurity 49
Olsalazine Impurity B Olsalazine Impurity B
Parecoxib sodium Impurity 32 Parecoxib sodium Impurity 32
Rosuvastatin Impurity 39 Rosuvastatin Impurity 39
Tofacitinib Impurity 95 Tofacitinib Impurity 95
Vildagliptin Impurity ZA4 Vildagliptin Impurity ZA4
(E)-4-(2-(1-(m-tolyl)ethylidene)hydrazinyl)benzenesulfonamide (E)-4-(2-(1-(m-tolyl)ethylidene)hydrazinyl)benzenesulfonamide C15H17N3O2S
Gefitinib impurity M Gefitinib impurity M
Linagliptin Impurity CD10088 Linagliptin Impurity CD10088
Tacrolimus Ring-opening Impurity Tacrolimus Ring-opening Impurity 1393890-33-9 C44H69NO12
Tadalafil Impurity 35 Tadalafil Impurity 35 749864-17-3 C20H18N2O4
Epinastine Impurity 1 HCl Epinastine Impurity 1 HCl 141342-71-4 C15H15N3O2
Flurbiprofen Impurity 5 Flurbiprofen Impurity 5 124635-84-3 C18H19FO4
Azacitidine Impurity 31 Azacitidine Impurity 31 65024-85-3 C11H16O8
Diazepam Impurity 3 Diazepam Impurity 3 176796-46-6 C17H17ClN2O2
Pitavastatin Impurity 19 Sodium Salt Pitavastatin Impurity 19 Sodium Salt 1980814-87-6 C25H24FNO5
N-(4-(4-fluorophenyl)-5-((E)-2-((2R,4R)-4-hydroxy-6- oxotetrahydro-2H-pyran-2-yl)vinyl)-6-isopropylpyrimidin- 2-yl)-N-methylmethanesulfonamide N-(4-(4-fluorophenyl)-5-((E)-2-((2R,4R)-4-hydroxy-6- oxotetrahydro-2H-pyran-2-yl)vinyl)-6-isopropylpyrimidin- 2-yl)-N-methylmethanesulfonamide C22H26FN3O5S
Fulvestrant EP Impurity E Fulvestrant EP Impurity E 2170200-14-1 C32H45F5O3S
Edaravone Impurity 16 Edaravone Impurity 16
Linagliptin Impurity 50 Linagliptin Impurity 50
Landiolol impurity K Landiolol impurity K 190601-22-0 C19H29N3O6
Efinaconazole Impurity 13 Efinaconazole Impurity 13 2055038-61-2 C18H22F2N4O
Crisaborole Impurity Crisaborole Impurity 906673-42-5 C14H10BNO3
tert-butyl 2-((4R,6S)-6-(2-(2-(4-fluorophenyl)-5-isopropyl-3-phenyl- 4-(phenylcarbamoyl)-1H-pyrrol-1-yl)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate tert-butyl 2-((4R,6S)-6-(2-(2-(4-fluorophenyl)-5-isopropyl-3-phenyl- 4-(phenylcarbamoyl)-1H-pyrrol-1-yl)ethyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate 947249-30-1 C40H47FN2O5
Olanzapine impurity N Olanzapine impurity N C17H20N4S
Cabozantinib impurity 25 Cabozantinib impurity 25
Afatinib impurity 43 Afatinib impurity 43
Vildagliptin Impurity 39 Vildagliptin Impurity 39
Tazobactam Impurity D Tazobactam Impurity D
Palonosetron Impurity 22 Palonosetron Impurity 22 1217547-14-2 C19H24N2O2
Pitavastatin Impurity 35 Pitavastatin Impurity 35
Pralatrexate Impurity 15 Pralatrexate Impurity 15
Pitavastatin Impurity 52 Pitavastatin Impurity 52
Pitavastatin Impurity 60 Pitavastatin Impurity 60 1661064-71-6 C25H22FNO3
Lenvatinib Impurity 43 Lenvatinib Impurity 43
Voriconazole Impurity 10 Voriconazole Impurity 10
Prednicarbate Impurity D Prednicarbate Impurity D
Olprinone Impurity A Olprinone Impurity A 141354-29-2 C12H10N4O
Everolimus EP Impurity E Everolimus EP Impurity E 1237826-25-3 C52H79NO14
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