1-(2-(N-Methylpiperazino)ethyl)-1,9-dimethyl-1,3,4,9-tetrahydropyrano(3,4-b)indole dimaleate 42920-51-4 Pyrano(3,4-b)indole, 1,3,4,9-tetrahydro-1,9-dimethyl-1-(2-(N-methylpiperazino)ethyl)-, dimaleate