Based on the data we got, we believed that there should be a third resonant structure of the reaction intermediate hydroxyethyl thiamine pyrophosphate ( HEThDP) besides the reported enamine resonant structure and C2-a-alkenyl carbanion resonant structure, which might be named enol resonant structure. 根据我们得到的数据,我们认为其重要的反应中间体羟乙基硫胺素焦磷酸(HEThDP)除文献报道的烯铵结构和C2α-碳负离子结构之外,还存在第三种共振结构,即烯醇式结构。