Its main chemical constituents are composed of organosulfur compounds and steroid saponins.

其化学成分主要为含硫有机化合物和皂苷类成分。

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The result shows that EI fragmentation process of cholesterol esters is determined mostly by the steroid nucleus, and there is almost no difference among the mass spectra of various compounds.

结果表明：胆甾醇酯的EI质谱裂解途径主要由甾环决定，各化合物谱图之间几乎无差别；

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Microbial conversion is a necessary process in the synthetic routes of steroid medicines, a group of hydrophobic compounds and their intermediates.

微生物转化是许多甾体药物或其中间体合成路线中不可或缺的关键环节。

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Alternatively, the 4-amino compounds are prepared by first nitration and then reduction of the appropriate steroid under appropriate reaction conditions.

另外，通过首先硝化，然后在适当反应条件下还原适当的甾类化合物制备4 -氨基化合物类。

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Alternatively, the 4-amino compounds are prepared by first nitration and then reduction of the appropriate steroid under appropriate reaction conditions.

另外，通过首先硝化，然后在适当反应条件下还原适当的甾类化合物制备4 -氨基化合物类。

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