InChI=1S/C21H32O8/c1-9(6-12-5-4-10(2)13-7-14(22)11(3)15(12)13)8-28-21-18(25)16(23)17(24)19(29-21)20(26)27/h6,10,12-14,16-19,21-25H,4-5,7-8H2,1-3H3,(H,26,27)/b9-6+