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