2H-Furo(2',3':7,8)naphtho(2,3-c)(1)benzopyran-6,13(1H,12H)-dione, 2-isopropenyl-8,9-dimethoxy- 2H-Furo(2',3':7,8)naphtho(2,3-c)(1)benzopyran-6,13(1H,12H)-dione, 8,9-dimethoxy-2-(1-methylethenyl)- 6385-66-6