4-(Ethyl(1,2,3,4-tetrahydro-6,7-dimethoxy-2-naphthalenyl)amino)butyl 3,4-dimethoxybenzoate 69788-34-7 Benzoic acid, 3,4-dimethoxy-, 4-(ethyl(1,2,3,4-tetrahydro-6,7-dimethoxy-2-naphthalenyl)amino)butyl ester, hydrochloride