2',3',4',5'-Tetrahydro-1,3',3'-trimethylspiro(piperidine-4,1'-(1H)pyrido(4,3-b)indole) 2HCl 60948-04-1 Spiro(piperidine-4,1'-(1H)pyrido(4,3-b)indole), 2',3',4',5'-tetrahydro-1,3',3'-trimethyl-, dihydrochloride