1760-27-6 2H-FURO[2,3-H]-1-BENZOPYRAN-2-ONE, 8-(1-METHYLETHENYL)- 2H-Furo(2,3-h)-1-benzopyran-2-one, 8-(1-methylethenyl)- 8-(1-Methylethenyl)-2H-furo(2,3-h)-1-benzopyran-2-one