N,N'-Dimethylpropane-1,3-diamine methyl-(3-methylaminopropyl)amine 1,3-Bis(methylamino)propane ST5410270 N,N′-Dimethyl-1,3-propanediamine N,N'-Dimethyltrimethylenediamine 1,3-Propanediamine, N,N'-dimethyl- EINECS 203-859-1 308110_ALDRICH