InChI=1S/C21H20O12/c1-30-13-6-12-10(5-11(31-12)7-2-8(22)4-9(23)3-7)14(24)18(13)32-21-17(27)15(25)16(26)19(33-21)20(28)29/h2-6,15-17,19,21-27H,1H3,(H,28,29)