InChI=1S/C21H32O8/c1-10-3-5-13(15-11(2)4-6-14(10)15)7-12(8-22)9-28-21-18(25)16(23)17(24)19(29-21)20(26)27/h7,10,13-14,16-19,21-25H,3-6,8-9H2,1-2H3,(H,26,27)/b12-7+