Chemical constituents from Dendrobium huoshanense and their chemotaxonomic significance

Twenty-three known compounds were separated from the 75% ethanol extract of D. huoshanense, which are divided into four categories: bibenzyl derivatives (1-14), alkaloids (15-19), butanolides (20, 23), phenolic compounds (21, 22). Their structures were determined based on NMR spectroscopic data and validated through comparison with previously reported data. Among them, Compounds 1, 15-18 and 23 represent the first instances of being extracted from Orchidaceae family. Compounds 2 and 20 were isolated firstly from the genus Dendrobium. Additionally, compounds 5-8, 14 and 19 have been isolated from D. huoshanense for the first time. It is worth noting that compounds 18 and 23 were isolated from plants for the first time. Furthermore, the taxonomic implications of the isolated compounds are examined.