InChI=1S/C21H32O8/c1-9(8-28-19-16(25)14(23)15(24)17(29-19)18(26)27)4-5-13(22)20(2)10-6-11-12(7-10)21(11,20)3/h4,10-17,19,22-25H,5-8H2,1-3H3,(H,26,27)/b9-4-