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aReagents: (a) NH2NH2, MeOH, rt, reflux, 65% yield; (b) pyridine, 1,4-dioxane, reflux, 31% yield; (c) ethyl bromoacetate, LitBuO, DMF, rt, 100% yield; (d) NaOH, MeOH/H2O, 54% yield. rt: room temperature
