Azilsartan Impurity H Catalogue A195628 CAS 1499167-72-4 M.W 416.44 M.F C23H20N4O4 Specifications FAQs (Z)-methyl 3-((2'-(N'-hydroxycarbamimidoyl)-[1,1'-biphenyl]-4-yl)methyl)-2-oxo-2,3-dihydro-1H-benzo[d]imidazole-4-carboxylate