Arbidol Impurity 5 Catalogue A124315 CAS 1130901-04-0 M.W 463.39 M.F C21H23BrN2O3S Specifications FAQs ethyl 6-bromo-5-hydroxy-1-methyl-4-((methylamino)methyl)-2-((phenylthio)methyl)-1H-indole-3-carboxylate