InChI=1S/C21H18O12/c22-5-6-3-8-11(15(26)12-7(13(8)24)1-2-9(23)14(12)25)10(4-6)32-21-18(29)16(27)17(28)19(33-21)20(30)31/h1-4,16-19,21-23,25,27-29H,5H2,(H,30,31)