InChI=1S/C21H30O9/c1-5-9-12(22)6-10-8(2)13(7-11(14(9)10)21(3,4)28)29-20-17(25)15(23)16(24)18(30-20)19(26)27/h5,10-11,13-18,20,23-25,28H,2,6-7H2,1,3-4H3,(H,26,27)/b9-5-