英语语法分析

Methods: Referring to dienogest's construction features, we reconstructed anordrin be- ginning with diketone.

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。

The invention is related to preparation process of 1,2-diketone monoketal which is flashing agent of ultraviolet light.

一种制备芳香族1，2一二酮的单缩酮的方法，属于紫外光引发剂技术领域。

Novel synthetic methods for alkyl methyl ketone, symmetric diketone , long-chain diketone and macrocyclic ketone were provided.

利用二苯并咪唑盐与格利雅试剂的加成-水解反应，提出了长链二酮的新合成方法。