1,3-Propanediamine, N,N-diethyl-N'-(4-methyl-5H-pyrido(4,3-b)indol-1-yl)-, (Z)-2-butenedioate (1:2) 1-(3-Diethylaminopropylamino)-4-methyl-5H-pyrido(4,3-b)indole dimaleate 111380-12-2 SR 95400A