InChI=1S/C21H32O7/c1-9(2)5-11(8-20(3)10-6-12-13(7-10)21(12,20)4)27-19-16(24)14(22)15(23)17(28-19)18(25)26/h5,10-17,19,22-24H,6-8H2,1-4H3,(H,25,26)