InChI=1S/C21H28O10/c1-4-10-6-14(21(3,28)8-22)29-13-5-9(2)12(7-11(10)13)30-20-17(25)15(23)16(24)18(31-20)19(26)27/h4-5,7,10,14-18,20,22-25,28H,1,6,8H2,2-3H3,(H,26,27)