InChI=1S/C21H22O10S/c1-13(5-8-21(2,20(23)24)12-30-32(25,26)27)6-9-29-19-14-3-4-18(22)31-17(14)11-16-15(19)7-10-28-16/h3-4,6-7,10-11H,5,8-9,12H2,1-2H3,(H,23,24)(H,25,26,27)/b13-6+