InChI=1S/C21H32O9/c1-8-10-4-5-21(3)13(6-11(23)9(2)14(21)18(10)30-19(8)27)29-20-17(26)16(25)15(24)12(7-22)28-20/h9-18,20,22-26H,1,4-7H2,2-3H3