InChI=1S/C21H32O7/c1-9-5-6-11-13(20(11,2)3)12-10(9)7-8-21(12,4)28-19-16(24)14(22)15(23)17(27-19)18(25)26/h11-17,19,22-24H,5-8H2,1-4H3,(H,25,26)