InChI=1S/C20H28O7/c1-6-10(2)18(23)27-15-9-20(5,25)16(22)8-13(21)11(3)7-14-17(15)12(4)19(24)26-14/h6-7,13-17,21-22,25H,4,8-9H2,1-3,5H3