1-(3-Dimethylaminopropyl)-1,9-dimethyl-1,3,4,9-tetrahydropyrano(3,4-b)indole maleate 57791-05-6 Pyrano(3,4-b)indole, 1,3,4,9-tetrahydro-1,9-dimethyl-1-(3-(dimethylamino)propyl)-, maleate