Constituents of the Edible Leaves of with Potential Analgesic Activity.

has long been consumed as a popular vegetable and tea in Southeast Asian countries, including Malaysia and southern mainland China, and is effective in the treatment of colds and inflammation. In the search for active metabolites that can explain its traditional use as an antipyretic, six new phloroacetophenone derivatives (-) along with seven known compounds (, , and -) were isolated from the leaves of . Their chemical structures were confirmed by extensive spectroscopic analysis including NMR, IR, ECD, and HRMS. All compounds isolated from the leaves of (-) have a phloroacetophenone skeleton. Notably, the new compound contains an additional cyclobutane moiety in its structure. The bioactivities of the isolated compounds were evaluated, and compounds , , and inhibited tumor necrosis factor-α-induced prostaglandin E. Moreover, the major constituent, 3,5-di--β-d-glucopyranosyl phloroacetophenone (), was found to be responsible for the antipyretic activity of based on in vivo experiments.