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