InChI=1S/C20H18O10S/c1-25-16-6-12-15(8-17(16)26-2)28-9-18-20(12,21)19(30-31(22,23)24)11-5-10-3-4-27-13(10)7-14(11)29-18/h3-8,18-19,21H,9H2,1-2H3,(H,22,23,24)