1-(2-Dimethylaminoethyl)-1-methyl-1,3,4,9-tetrahydropyrano(3,4-b)indole oxalate 57790-91-7 Pyrano(3,4-b)indole, 1,3,4,9-tetrahydro-1-(2-(dimethylamino)ethyl)-1-methyl-, oxalate