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condensed nucleus
Cephalotaxine is one compound of five-fused ring structure.
三尖杉碱具有五元稠环结构。
youdao
The heterocyele in (4) is a masked fused ring held in abeyance.
中的杂环可以看作是一个被掩蔽的,处于暂时停顿状态的稠环。
In fused-ring and bridged-ring compounds two carbons are common to the two rings.
在稠环和桥环化合物中,两个碳原子是两个环公用的。
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