Allantoin is one of the important urea derivative products.

尿囊素是一种重要的尿素衍生产品.

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Celiprolol enantiomer was resolved directly by using phase HPLC with urea derivative chiral stationary phase ( CSP ).

用脲衍生物型手性固定相直接拆分了药物对映体噻利洛尔.

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