InChI=1S/C21H28O12/c1-2-3-9-4-6-10(7-5-9)31-21-17(27)13(23)12(22)11(32-21)8-30-20-16(26)14(24)15(25)18(33-20)19(28)29/h2,4-7,11-18,20-27H,1,3,8H2,(H,28,29)