Amlodipine Impurity 2 Catalogue A236752 CAS 949155-13-9 M.W 391.85 M.F C20H22ClNO5 Specifications FAQs 5-ethyl 7-methyl 6-(2-chlorophenyl)-8-methyl-3,4,5,6-tetrahydro-2H- benzo[b][1,4]oxazine-5,7-dicarboxylate