4,5-Dioxodehydrocrebanine 5H-Benzo(g)-1,3-benzodioxolo(6,5,4-de)quinoline-5,6(7H)-dione, 9,10-dimethoxy-7-methyl- 77784-21-5 9,10-Dimethoxy-7-methyl-5H-benzo(g)-1,3-benzodioxolo(6,5,4-de)quinoline-5,6(7H)-dione CCRIS 3816