InChI=1S/C20H26O7/c1-10-5-18-8-20(10,27)4-3-12(18)19(9-21)7-11(22)6-17(2,16(25)26)14(19)13(18)15(23)24/h9,11-14,22,27H,1,3-8H2,2H3,(H,23,24)(H,25,26)