“…). 1 H NMR (400 MHz, DMSO-d 6 ) δ ppm: 2.03 (s, 3H, CH 3 ), 2.24 (s, 3H, CH 3 ), 2.47 (s, 3H, CH 3 ), 4.85 (s, 1H, -CH-), 6.82 (s, 2H, -NH 2 ), 7.00-7.90 (m, 16H, Ar-H), 9.97 (s, 1H, NH). 13 H NMR (400 MHz, DMSO-d6) δ ppm: 2.03 (s, 3H, CH3), 2.24 (s, 3H, CH3), 4.85 (s, 1H, -CH-), 6.82 (s, 2H, -NH2), 7.00-7.90 (m, 16H, Ar-H), 9.97 (s, 1H, NH).…”