InChI=1S/C20H20O5/c1-4-20(2,3)18-14(23)10-16-17(19(18)24)13(22)9-15(25-16)11-5-7-12(21)8-6-11/h4-8,10,15,21,23-24H,1,9H2,2-3H3/t15-/m0/s1