1,2,3,4-Tetrahydro-9H-pyrido(3,4-b)indole hydrochloride 16502-01-5 2,3,4,9-Tetrahydro-1H-pyrido(3,4-b)indole hydrochloride 58911-02-7 9H-Pyrido(3,4-b)indole, 2,3,4,9-tetrahydro-, hydrochloride EINECS 261-493-8 Tetrahydronorharman