InChI=1S/C21H18O12/c22-9-4-5-10(23)18-11(9)12(24)14(26)17(32-18)7-2-1-3-8(6-7)31-21-16(28)13(25)15(27)19(33-21)20(29)30/h1-6,13,15-16,19,21-23,25-28H,(H,29,30)