InChI=1S/C20H20O5/c1-4-20(2,3)18-15(24)9-13(22)17-14(23)10-16(25-19(17)18)11-5-7-12(21)8-6-11/h4-9,16,21-22,24H,1,10H2,2-3H3/t16-/m0/s1