InChI=1S/C21H20O9S/c1-11(9-29-31(24,25)26)3-5-14-16(23)8-18-19(20(14)27-2)21-15(10-28-18)13-6-4-12(22)7-17(13)30-21/h3-4,6-8,22-23H,5,9-10H2,1-2H3,(H,24,25,26)