Chemical constituents from the leaves of Styrax annamensis Guill

A phytochemical study of the ethyl acetate extract (EtOAc) of Styrax annamensis leaves resulted in the isolation and determination of six known compounds, including three nor‐neolignans type 2‐phenylbenzofurans egonol ( 1 ), egonoic acid ( 2 ) and (–)‐machicendiol ( 3 ), two lignans styraxin ( 4 ) and vladinol D ( 5 ), and a triterpenoid pomolic acid ( 6 ). The chemical structures of these compounds were determined by NMR spectroscopies, and MS data. This is the first time to isolate these compounds from S. annamensis species. Compounds 3 and 5 have also been observed from genus Styrax for the first time.