“…,13 C NMR (DMSO-d 6 , d ppm): 30.36 (2CH 3 ), 115.03, 116.28, 121.26, 124.37, 127.79, 132.71, 134.29, 140.05, 141.47, 143.82 (Ar-C), 155.65 (2C]O), MS, m/z (%): 424 [M + ] (34.82), analysis for C 16 H 16 N 4 O 6 S 2 (424.45), calcd% C, 45.28; H, 3.80; N, 13.20; S, 15.11, found: % C, 45.39; H, 3.73; N, 13.46; S, 15.34. Yield (83%), m.p.…”