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