1-Propanamine, N,2-dimethyl-3-(2-methoxyphenoxy)-, (Z)-2-butenedioate (1:1) 79306-70-0 N,2-Dimethyl-3-(2-methoxyphenoxy)-1-propanamine maleate N-Methyl-3-(2-methoxyphenoxy)-2-methylpropylamine hydrogen maleate VUFB-13704