InChI=1S/C20H22O6/c1-5-10(2)18(22)25-14-8-12(9-21)13-6-7-20(4,24)16(13)17-15(14)11(3)19(23)26-17/h5-7,9,14-17,24H,3,8H2,1-2,4H3