1H-Indolo(3,2,1-de)(1,5)naphthyridin-6-ol, 2,3,3a,4,5,6-hexahydro-3-ethyl-6-methyl- 3-Ethyl-6-methyl-2,3,3a,4,5,6-hexahydro-1H-indolo(3,2,1-de)(1,5)naphthyridin-6-ol 65285-13-4