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1.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.

1.以烯酰氯、烯酸酐烯酸作酰化剂，胆酸酯分子中羟的反应活性。

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as fresh as paint, as good as, as if, as if by magic, as it is, as it were, as long as, as luck would have it, as much, as much as possible,

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3G, 401(K), a,

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