英语语法分析

The products were identified to be brassicasterol.

产物经鉴定为菜薹甾醇。

The products were identified to be brassicasterol and stigmasterol respectively based on their chromatographic and spectral properties as well as by comparison with the authentic samples.

用色谱、光谱以及与标准品对照等方法鉴定代谢产物的结构分别为菜子甾醇和豆甾醇。