1,4-Butanediamine, N-2,3-butadienyl-N'-methyl-, dihydrochloride 93565-00-5 Mdl 72.521 Mdl 72521 N-Methyl-N-(2,3-butadienyl)-1,4-butanediamine N1-(2,3-Butadienyl)-N2-methylbutane-1,4-diamine