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