API-Products Methantheline bromide (MTB) Diethyl-(2-hydroxyethyl)methylammoniumbromide-9-xanthencarboxylate, N,N-Diethyl-N-methyl-2-(9-xanthenecarbonyloxy)ethylammoniumbromide 53-46-3 CAS-number C21H26BrNO3 Molecular Formula 420.35 g/mol Molecular weight on request Packaging unit