InChI=1S/C21H30O8/c1-5-10-13(22)6-12-9(4)14(7-11(8(2)3)15(10)12)28-21-18(25)16(23)17(24)19(29-21)20(26)27/h5,8,11-12,14-19,21,23-25H,4,6-7H2,1-3H3,(H,26,27)/b10-5-