The H2O, H2O/MeOH (1 : 1) and MeOH extracts of the wood of Taxus yunnanensis possessed significant DPPH radical scavenging and nitric oxide (NO) inhibitory activities. Chemical investigation of these extracts led us to isolation of nineteen compounds, i. e., five lignans, two simple phenolics, and
Five compounds were isolated from the bark of Taxus yunnanensis. Their structures were identified on the basis of spectral analysis and physico-chemical constants as taxol C-7-xylose, taxol B, 10-deacetyl baccatin III, taxusin and 2R,3R-catechin.
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