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