InChI=1S/C21H18O12/c22-7-1-2-9-12(5-7)31-6-10(13(9)23)8-3-4-11(15(25)14(8)24)32-21-18(28)16(26)17(27)19(33-21)20(29)30/h1-6,16-19,21-22,24-28H,(H,29,30)