Four New Dibenzocyclooctadiene Lignans from Schisandra rubriflora.

From the aerial parts of Schisandra rubrifloraFranchRehd. et Wils., four new dibenzocyclooctadiene lignans, methylgomisin R 1, +14tigloylgomisin K32, 12demethylwuweilignan I 3, schisandrene A 4, together with 13known lignans, were isolated. The structures of four new compounds were elucidated by spectroscopic methods including extensive 1D and 2DNMR techniques. [ABSTRACT FROM AUTHOR]