InChI=1S/C21H20O10S/c1-21(10-30-32(25,26)27)6-5-13-17(31-21)8-15(23)18(20(13)28-2)14-9-29-16-7-11(22)3-4-12(16)19(14)24/h3-4,7-9,22-23H,5-6,10H2,1-2H3,(H,25,26,27)