InChI=1S/C21H20O11/c22-13-9(8-4-2-1-3-5-8)7-30-10-6-11(14(23)15(24)12(10)13)31-21-18(27)16(25)17(26)19(32-21)20(28)29/h1-6,9,16-19,21,23-27H,7H2,(H,28,29)