py.ran
n.（名词）Either of two isomeric compounds with the formula C5H 'O, having a ring of five carbon atoms and one oxygen atom. 吡喃：化学分子式是C5H 'O的两种同分异构化合物中的任一种，且有五个碳原子和一个氧原子构成的环状物
来源：pyrone [heterocyclic compound] pyr(o)- -one pyrone [杂环化合物] pyr(o)- -one-an 2-an2
