This paper studies derivatives of higher order about product of three functions, and obtains a group dependent derivative formulas.

研究了三个函数乘积的高阶导数，得到了一组相应的导数公式。

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To extend the interpolation problems of Lagrange and Taylor is the ordinary problem about interpolation with derivatives of higher order;

将拉格朗日插值问题、泰勒插值问题揉合为一体进行综合推广，即高次带导数的插值问题的一般情形；

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In order to search for new derivatives with longer duration of action and higher activity, captopril esters and thioethers were synthesized.

因半衰期短，为了延长药物作用时间和提高药效，本文合成了它的酯和硫醚类衍生物。

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