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- Selected data for the synthesized compounds. 1e: m.p. 215–217°C. 1H-NMR (if not stated otherwise, 200 MHz, DMSO-d6, δ): 1.91 (s, 2H, CH3); 6.64 (s, 2H, NH2); 7.26–7.38 (m, 5H, ArH), 1h: m.p. > 250°C, 1H-NMR: 1.07 (d, 6H, 2 × CH3 J = 6.8 Hz); 3.99 (septet, 1H, CH, J = 6.8 Hz); 5.36 (s, 2H, CH2); 6.70 (s, 2H, NH2); 10.93 (bs, 1H, NH); 12.85 (bs, 1H, NH), 1i: m.p. 218–220°C. 1H-NMR: 3.71 (s, 3H, CH3); 6.67 (s, 2H, NH2); 6.80–6.90 (m, 3H, ArH); 7.22–7.29 (m, 1H, ArH), 2d: m.p. 259–260°C, 1H-NMR: 5.28 (s, 2H, CH2); 5.50 (s, 2H, CH2), 6.76 (s, 2H, NH2); 7.20–7.42 (m, 10H, Ar-H); 10.82 (bs, 1H, NH). X-ray crystal structure CCDC deposition number 289468