1-(2-Dimethylaminoethyl)-1-methyl-9-propyl-1,3,4,9-tetrahydropyrano(3,4-b)indole maleate 57790-99-5 Pyrano(3,4-b)indole, 1,3,4,9-tetrahydro-1-(2-(dimethylamino)ethyl)-1-methyl-9-propyl-, maleate