InChI=1S/C21H18O11/c22-11-6-10-13(7-12(11)23)31-14(15(10)24)5-8-1-3-9(4-2-8)30-21-18(27)16(25)17(26)19(32-21)20(28)29/h1-7,16-19,21-23,25-27H,(H,28,29)