2-(1\'Methylethenyl)naphtho[2,3-b]furan-4,9-dione 2-Isopropenyl-2,3-dihydro-naphtho[2,3-b]furan-4,9-dione 2-isopropenylnaphtho[2,3-b]furan-4,9-dione InChI=1/C15H10O3/c1-8(2)12-7-11-13(16)9-5-3-4-6-10(9)14(17)15(11)18-12/h3-7H,1H2,2H naphtho[2,3-b]furan-4,9-dione, 2-(1-methylethenyl)-