2 sentences

1. 酰基是这类有机化合物的核心结构。

   xiān jī shì zhè lèi yǒu​jī huà​hé​wù de hé​xīn jié​gòu.

   The acyl group is the core structure of this class of organic compounds.

   Source: Dong Chinese Dictionary

2. 这种有机化合物的环状结构中含有一个杂原子。

   zhè zhǒng yǒu​jī huà​hé​wù de huán​zhuàng jié​gòu zhōng hán​yǒu yī gè zá​yuán​zǐ.

   The cyclic structure of this organic compound contains a heteroatom.

   Source: Dong Chinese Dictionary