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