Azilsartan Impurity M Catalogue A195633 CAS 632322-61-3 M.W 397.43 M.F C24H19N3O3 Specifications FAQs 1-((2'-cyano-[1,1'-biphenyl]-4-yl)methyl)-2-ethoxy-1H-benzo[d]imidazole-7-carboxylic acid