4H-furo[2,3-h]-1-benzopyran-4-one, 5-methyl-2-(2-oxopropyl)- 5-methyl-2-(2-oxopropyl)-4H-furo[2,3-h]chromen-4-one InChI=1/C15H12O4/c1-8-5-13-11(3-4-18-13)15-14(8)12(17)7-10(19-15)6-9(2)16/h3-5,7H,6H2,1-2H