“…Yield 79%; yellow solid; M.p. 186-188 O C; FTIR (KBr, ν/cm -1 ): 3309 (OH), 3246 (NH), 2960 (C-H), 2227 (CN), 1737, 1708 (2C=O), 1612 (aromatic C=C); 1 H NMR (500 MHz, DMSO-d 6 ) δ 12.50 (s, 1H, NH), 9.34 (s, 1H, OH), 7.98 (s, 1H, =CH), 7.97 (dd, J = 7.7 Hz, 2H)7.84 (t, J = 7.7 Hz, 2H), 7.63 (d, J = 7.5 Hz, 2H), 6.78 (d, J = 7.5 Hz, 2H); 13…”