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我们合成了化合物5,6,7,8,9,这些化合物的合成至今尚未见文献报道。化合物4虽然是已知化合物,但我们研究了便于实验室制备的方法。
We synthesized compounds 5,6,7,8,9, the synthesis of these compounds has not been reported in the literature. Although compound 4 is a known compound, we investigated a convenient method for laboratory preparation.