InChI=1S/C21H32O8/c1-10(8-22)7-12-4-5-13(14-6-3-11(2)15(12)14)9-28-21-18(25)16(23)17(24)19(29-21)20(26)27/h7,12-14,16-19,21-25H,3-6,8-9H2,1-2H3,(H,26,27)/b10-7+