InChI=1S/C21H18O11S/c1-9-17(24)21(32-33(27,28)29)19(26)20(30-9)16-12(23)8-14-15(18(16)25)11(22)7-13(31-14)10-5-3-2-4-6-10/h2-9,19-21,23,25-26H,1H3,(H,27,28,29)