InChI=1S/C20H28O8/c1-2-3-7-10-20(17(28-20)12-8-5-4-6-9-12)11-26-19-15(23)13(21)14(22)16(27-19)18(24)25/h4-6,8-9,13-17,19,21-23H,2-3,7,10-11H2,1H3,(H,24,25)