[Non-taxoid chemical constituents from needles of Taxus cuspidata].

To study the chemical constituents in the needles of Taxus cuspidata collected from Japan. Chemical constituents were isolated by column chromatography, TLC and preparative HPLC. The structures were identified on the basis of NMR spectral analysis. Six non-taxoids were isolated and identified as: 4-[(1E)-3-hydroxy-1-buten-1-yl]-3,5,5-trimethyl-2-cyclohexen-1-one (1), megastigm-5-ene-3, 9-diol (2), 6alpha-epoxy-7-megastigmen-9-one (3), 4-(4-hydroxyphenyl)-2-butanone (4), 12-hydroxy-alpha-cyperone (5), scutellarein-7-O-alpha-L-rhamnoside (6). Compounds 2 - 6 are isolated from Taxus genus for the first time. Compound 1 is obtained from Taxus cuspidata for the first time.