Dabigatran Etexilate Impurity J Catalogue D112430 CAS 1642853-67-5 M.W 368.39 M.F C19H20N4O4 Specifications FAQs ethyl 3-(1-methyl-2-oxo-N-(pyridin-2-yl)-2,3-dihydro-1H-benzo[d]imidazole-5-carboxamido)propanoate