InChI=1S/C22H20O8S/c1-27-16-10-8-13(11-17(16)28-2)14-9-7-12-5-4-6-15-18(12)19(14)20(23)22(29-3)21(15)30-31(24,25)26/h4-11,21-22H,1-3H3,(H,24,25,26)