(1)Benzopyrano(3,4-b)(1)benzopyran-12(6H)-one, 6a,12a-dihydro-2,3,9-trimethoxy- 3564-85-0 6a,12a-Dihydro-2,3,9-trimethoxy-(1)benzopyrano(3,4-b)(1)benzopyran-12(6H)-one