1,2,3,4-Tetrahydro-1-oxo-.beta.-carboline 1,2,3,4-Tetrahydronorharman-1-one 17952-82-8 1H-Pyrido[3,4-b]indol-1-one, 2,3,4,9-tetrahydro- L-Oxonoreleagnine NSC147829