英语语法分析

The yield of furil increased to 91.7%(from 2-furaldehyde) after improvements in experimental procedure.

通过改进实验条件，使合成糠偶酰的产率提高到91.7%。

The formation, measurement of 2 furaldehyde and 5 hydroxymethyl 2 furaldehyde in date and their influences on the dry date were discussed.

还讨论了红枣中糠醛和5羟甲基呋喃甲醛的形成、测定及其对干枣品质的影响。

The structures of these compounds were determined as friedelin(1), 5 hydroxymethyl furaldehyde(2), limonin(3), nomilin(4), daucosterol(5)by spectral methods.

经光谱数据的分析，分别鉴定为木栓酮（1）、5 羟甲基糠醛（2 ）、柠檬苦素（3）、闹米林（4 ）及胡萝卜苷（5 ） 。