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Synthetic route for derivatives 1–7c, 1–7d and 1–7e. i: when R1 or both R1 and R2 = Cl, reaction conditions: CH3NHNH2/EtOH in an autoclave at 100 °C for 48 h; ii: all the other derivative reaction conditions: NH2NH2 and Pd/C in EtOH at 80 °C for 1 h.
