“…: 190–193°C (Lit. m.p: 190 –191°C) [ 38 ] ; IR (KBr) ʋ = 3440, 3330, 3021, 2192, 1530, 1350, 741 cm −1 ; 1 H NMR (400 MHz, DMSO‐d 6 ): δ (ppm) = 9.8 (s, 1H, OH), 8.09 (d, H, J = 4.0 Hz), 8.01 (s, 1H), 7.64 (t, 2H, J = 8.0 Hz), 7.04 (s, 2H, NH 2 ), 6.82 (s, H), 6.47 (d, 2H, J = 4.0 Hz), 6.43 (s, H), 4.9 (s, H).…”