METHODS:Isolation and identification were carried out by using various chromatography techniques and spectral methods.

方法：采用了各种层析分离技术，分得单体，经理化常数和光谱解析确定结构。

Methods Compounds were isolated by silica column chromatography, and their structures were elucidated by spectral methods.

方法用硅胶柱层析进行分离，用有机波谱学的方法进行结构鉴定。

With these spectral methods, the chemical composition and the structure of the polishing paste for plastics were identified.

通过上述光谱法确定了该塑料抛光膏的化学组成和结构。

Their method indicates that the mass of distant AGN black holes as estimated by other spectral methods is two to 10 times too high.

他们的研究方法表明，用其他光谱方法测量的遥远活动星系核的黑洞质量大概夸大了2-10倍。