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