[Quinic acid esters from herba of Siphonostegia chinensis]

To study the bioactive constituents, quinic acid esters, from Siphonostegia chinensis.The compounds were extracted with solvents, isolated by various column chromatography and identified by spectroscopic methods.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).All compounds were isolated from Siphonostegia for the first time.