Objective: To study the bioactive constituents, quinic acid esters, from Siphonostegia chinensis.
Method: The compounds were extracted with solvents, isolated by various column chromatography and identified by spectroscopic methods.
Result: Three quinic acid esters were isolated and identified as 3,4-di-O-caffeoylquinic acid(I), macranthoin F(II), and methyl ester of 3, 4,5-tri-O-caffeoylquinic acid (III).
Conclusion: All compounds were isolated from Siphonostegia for the first time.