InChI=1S/C24H22O6S/c1-2-23(18-7-4-3-5-8-18)24(19-11-13-21(14-12-19)29-16-15-25)20-9-6-10-22(17-20)30-31(26,27)28/h3-15,17H,2,16H2,1H3,(H,26,27,28)/b24-23+