184691-40-5 1H-Pyrido(3,4-b)indole-1,3(2H)-dione, 4,9-dihydro-2-(2-(4-phenyl-1-piperazinyl)ethyl)- 4,9-Dihydro-2-(2-(4-phenyl-1-piperazinyl)ethyl)-1H-pyrido(3,4-b)indole-1,3(2H)-dione