InChI=1S/C21H32O7/c1-10-8-11(20(2,3)4)16(12(9-10)21(5,6)7)27-19-15(24)13(22)14(23)17(28-19)18(25)26/h8-9,13-15,17,19,22-24H,1-7H3,(H,25,26)