InChI=1S/C21H16O12/c22-9-4-3-8-16-11(20(29)32-17(8)12(9)23)7-2-1-6(5-10(7)31-16)30-21-15(26)13(24)14(25)18(33-21)19(27)28/h1-5,13-15,18,21-26H,(H,27,28)