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