InChI=1S/C20H22O6/c1-9-4-5-13-10(2)6-14(25-20(23)12-7-15(21)24-8-12)17-11(3)19(22)26-18(17)16(9)13/h4,7,14-18,21H,3,5-6,8H2,1-2H3