InChI=1S/C21H36O8/c1-7-8-9-15(22)10-11-16(23)29-17-12(2)18(24)21(5,27-6)19(25)13(3)20(26)28-14(17)4/h10-15,17-19,22,24-25H,7-9H2,1-6H3/b11-10+