[Chemical study on ethyl acetate portion of Ehretia thyrsiflora, boraginaceae species of Kudingcha].

Objective: To investigate the chemical constituents of Ehretia thyrsiflora.Method: Compounds were isolated by using silica gel,Sephadex LH-20 and RP-C18 chromatography;their structures were elucidated by means of spectral data analysis.Result: Seven compounds were isolated and identified as methyl rosmarinate(1),caffeic acid(2),quercetin(3),kampferol(4),kaempferol 3-O-α-D-arabinoside(5),quercetin 3-O-α-D-arabinoside(6),and p-hydroxy benzoic acid(7).Conclusion: All these compounds were isolated from E.thyrsiflora for the first time.Compounds 2-7 were isolated from genus Ehretia for the first time.