The derivatives of the invention are free alkali or salt of the general formula compound.

本发明所述的衍生物为上述通式化合物的游离碱或盐。

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The formula of a compound gives information about the kinds and numbers of atoms that make up each molecule of that compound.

化合物的分子式提供了组成该化合物分子种原子的种类及其数量的信息。

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Before we can assign a structural formula to a compound, we must first know its molecular formula.

在确定一个化合物的结构式之前，首先应知道它的分子式。

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Yet despite the fact that we are all as familiar with this formula as we are with compound interest, very little of this intellectual water ever reaches our stone dry hearts.

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