InChI=1S/C20H18N2O8S/c1-28-15-8-10(2-4-13(15)30-31(25,26)27)18-20(24)17-14(29-18)5-3-12-16(17)11(9-22-12)6-7-21-19(20)23/h2-5,8-9,18,22,24H,6-7H2,1H3,(H,21,23)(H,25,26,27)