1,2,3,3a,4,5-Hexahydro-3-methyl-6H-indolo(3,2,1-de)(1,5)naphthyridin-6-one, hydrochloride 67877-73-0 6H-Indolo(3,2,1-de)(1,5)naphthyridin-6-one, 1,2,3,3a,4,5-hexahydro-3-methyl-, monohydrochloride