Azilsartan Impurity C Catalogue A195623 CAS 1397836-49-5 M.W 430.46 M.F C24H22N4O4 Specifications FAQs (Z)-2-ethoxy-1-((2'-(N'-hydroxycarbamimidoyl)-[1,1'-biphenyl]-4-yl)methyl)-1H-benzo[d]imidazole-7-carboxylic acid