Azilsartan Impurity V Catalogue A195642 CAS 1403474-70-3 M.W 484.51 M.F C27H24N4O5 Specifications FAQs ethyl 2-ethoxy-1-((2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)- [1,1'-biphenyl]-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylate