InChI=1S/C20H18N2O7S/c1-27-15-8-10(2-4-13(15)29-30(24,25)26)19-18-17-14(28-19)5-3-12-16(17)11(9-22-12)6-7-21-20(18)23/h2-5,8-9,18-19,22H,6-7H2,1H3,(H,21,23)(H,24,25,26)