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Reagent and reaction conditions: (i) EtOH, H2SO4, reflux 3 h, yield 78–90%; (ii) EtOH, NH2NH2.H2O, reflux 3 h, 70–90%; (iii) S-methylisothioureaa sulfate, NaOH, H2O, stirring, room temp (iv) fusion, 250 °C; (v) fusion, 210 °C; (vi) EtOH, NaOH, reflux.
