方法：以双酮为原料，结合双烯孕腈的药物结构特点对双炔失碳酯进行化学结构改造。
Methods: Referring to dienogest's construction features, we reconstructed anordrin be- ginning with diketone.
结构检索方法建立在图子图匹配算法VF 2的基础上，对其进行了必要的改造和扩展，使之适合于化学结构检索。
The VF2 graph matching algorithm on which the chemical structure search system was based has been modified and extended appropriately.
有机化学的专家们不断在物质的氢碳结构上进行研发，从结构和组成上改造其分子结构以生产医药品、燃料和其他能够被使用的产品。
Organic chemists are constantly exploring new ways to combine and restructure hydrocarbon molecules to make pharmaceuticals, fuels, and other products for human use.
有机化学的专家们不断在物质的氢碳结构上进行研发，从结构和组成上改造其分子结构以生产医药品、燃料和其他能够被使用的产品。
Organic chemists are constantly exploring new ways to combine and restructure hydrocarbon molecules to make pharmaceuticals, fuels, and other products for human use.
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