InChI=1S/C20H20N2O8S/c1-28-15-8-10(2-4-13(15)30-31(25,26)27)19-18(20(23)24)17-14(29-19)5-3-12-16(17)11(6-7-21)9-22-12/h2-5,8-9,18-19,22H,6-7,21H2,1H3,(H,23,24)(H,25,26,27)