Lignans, flavonoids and phenolic derivatives from Taxus mairei

From the twigs of Taxus mairei, 35 lignans, 2 sesquilignans, 4 flavonoids, 3 bisflavonoids, 13 phenolic derivatives, 2 sesquiterpenes, 3 bisnorsesquiterpenes, 3 long-chain carboxylic acids and 4 steroids were isolated. The new lignans and phenolic glucosides include 7'-hydroxynortrachelogenin, 7-hydroxymatairesinol, 3'-O-demethylepipinoresinol, taxiresinol 9-acetate, 3'-O-demethyltanegool, 8'-epitanegool, 3,3'-dimethoxy-4,4',9-trihydroxy-7,9'-epoxylignan-7'-one. 3-O-demethyldihydrodehydrodiconiferyl alcohol, taxumaiglucoside A heptaacetate, taxumaiglucoside B heptaacetate, and taxumaiglucoside C heptaacetate. Their structures were determined by spectral methods.