“…ν (cm -1 ): 3468 (OH), 1664 (C = O). 1 H NMR spectrum (400 MHz, DMSO-d 6 with the addition of TFA), δ (ppm): 1.98 -1.62 (m, 4H, CH 2 ), 2.91 -2.78 (m, 4H, CH 2 ), 3.86 -3.68 (m, 3H, CH 3 ), 6.92 (t, J = 8.1 Hz, 1H, ArH), 7.16 (d, J = 7.9 Hz, 1H, ArH), 7.70 (d, J = 8.9 Hz, 1H, ArH), 11.68 (s, 1H, OH), 12.16 (s, 1H, NH).…”