InChI=1S/C20H20O5/c1-20(2)17(25-20)8-13-15(22)6-5-11-14-9-23-16-7-10(21)3-4-12(16)19(14)24-18(11)13/h3-7,14,17,19,21-22H,8-9H2,1-2H3/t14-,17-,19-/m0/s1