InChI=1S/C20H28O7/c1-11(2)5-16(22)24-8-13-9-25-19(27-17(23)6-12(3)4)18-14(13)7-15(21)20(18)10-26-20/h7,9,11-12,15,18-19,21H,5-6,8,10H2,1-4H3