InChI=1S/C21H28O9/c1-5-10-7-14(21(3,4)27)28-13-6-9(2)12(8-11(10)13)29-20-17(24)15(22)16(23)18(30-20)19(25)26/h5-6,8,10,14-18,20,22-24,27H,1,7H2,2-4H3,(H,25,26)