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- Physical and spectral data for compound II: F(°C) 153 (Ethanol); Formula: C14H19N3O2; IR (KBr) v cm−1: 1730 (C=O), 3200 (NH); NMR 1H (CDCl3) δ ppm: 7.05 (m, 5H, Har), 5.10 (s, 1H, NH), 4.82 (m, 1H, 5-H), 3.63 (m, 2H, 4-H), 3.2 (m, 4H, CH2piperazine), 2.72 (m, 6H, CH2piperazine and NCH2); NMR 13C (CDCl3) δ ppm: 157.7 (C=O), 148.8, 129.1, 120.6, 116.2 (Cphenyl), 70.3 (C-5), 58.1 (CH2), 51.1 and 45.4 (Cpiperazine), 43.2 (C-4).
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