1. The propionyl chloride was found to be the appropriate acylating agent in terms of the cost.
   通过成本比较,认为丙酰氯是合适的酰化剂。
2. Acylation activity of hydroxyl groups in methyl cholicate has been determined by the use of methacryloyl chloride, methacryloyl anhydride and methacrylic acid as the acylating agents.
   以甲基丙烯酰氯、甲基丙烯酸酐和甲基丙烯酸作酰化剂，研究了胆酸甲酯分子中羟基的反应活性。

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