InChI=1S/C23H20N2O4S/c26-22-21(16-17-30(28,29)20-14-8-3-9-15-20)23(27)25(19-12-6-2-7-13-19)24(22)18-10-4-1-5-11-18/h1-15,21H,16-17H2