InChI=1S/C21H20O12/c22-9(6-8-4-2-1-3-5-8)13(24)12-11(7-10(23)14(25)15(12)26)32-21-18(29)16(27)17(28)19(33-21)20(30)31/h1-5,7,16-19,21,23,25-29H,6H2,(H,30,31)