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Synthesis of compound V. Reagents and conditions: (a) potassium carbonate, hydrazine hydrate, tetrahydrofuran, 0–25 °C; (b) sodium hydride, ethyl acetate/ethyl ether, −5–25 °C; (c) sulfuric acid, ethanol, 75 °C; (d) sulfuric acid, H2O, 100 °C.
