4-(3-methyl-2-oxobutoxy)-7H-furo[3,2-g]chromen-7-one 7H-furo[3,2-g][1]benzopyran-7-one, 4-(3-methyl-2-oxobutoxy)- InChI=1/C16H14O5/c1-9(2)12(17)8-20-16-10-3-4-15(18)21-14(10)7-13-11(16)5-6-19-13/h3-7,9H,8H2,1-2H