InChI=1S/C21H32O8/c1-10(9-22)8-12-6-7-21(3,13-5-4-11(2)14(12)13)29-20-17(25)15(23)16(24)18(28-20)19(26)27/h8,12-13,15-18,20,22-25H,4-7,9H2,1-3H3,(H,26,27)/b10-8+