InChI=1S/C21H32O8/c1-10(8-22)4-3-5-21(11-6-12-13(7-11)20(12,21)2)9-28-19-16(25)14(23)15(24)17(29-19)18(26)27/h4,11-17,19,22-25H,3,5-9H2,1-2H3,(H,26,27)/b10-4-