The purified compound showed a molecular formula of C28H44O3, displaying characteristic features of epidioxy sterols and was reverted to ergosterol when submitted to S. schenckii enzymatic extract.

纯化化合物展示了分子式C28H44O3，显示过氧甾醇的特征和复归麦角提交给美国时，申克酶提取。

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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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Gives a formula for calculation of crude oil molecular weight and compares the results calculated from crude oil samples.

给出了一个原油分子量计算公式，并对原油样品的计算结果进行了比较。

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