22055-22-7 9-(13-Benzodioxol-5-yl)-4-hydroxy-6,7-dimethoxynaphtho(2,3-c)furan-1(3H)-one Diphyllin NSC 309691 Naphtho(2,3-c)furan-1(3H)-one, 4-hydroxy-6,7-dimethoxy-9-(3,4-(methylenedioxy)phenyl)- Naphtho(2,3-c)furan-1(3H)-one, 9-(1,3-benzodioxol-5-yl)-4-hydroxy-6,7-dimethoxy-