1,3-Propanediamine, N,N-diethyl-N'-(8-methoxy-4-methyl-5H-pyrido(4,3-b)indol-1-yl)-, (Z)-2-butenedioate (1:2) 1-(3-Diethylaminopropylamino)-8-methoxy-4-methyl-5H-pyrido(4,3-b)indole dimaleate 111380-20-2 SR 957000A