InChI=1S/C21H18O10/c22-13-9-5-1-3-7-11(9)29-18(15(13)24)10-6-2-4-8-12(10)30-21-17(26)14(23)16(25)19(31-21)20(27)28/h1-8,14,16-17,19,21,23-26H,(H,27,28)