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