(1)Benzopyrano(5,4,3-cde)(1,3)dioxolo(4,5-h)(1)benzopyran-5,11-dione, 1,2,3-trimethoxy- 3,4,5-O-Trimethyl-3',4'-O,O-methylidineflavellagic acid 3,4,5-Tmmf 69251-99-6