Hernsubanine E, a new hasubanan alkaloid from Stephania hernandifolia.

A new hasubanan alkaloid, hernsubanine E (1), as well as two known compounds p-hydroxybenzaldehyde (2) and (-)-syringaresinol (3) have been isolated from the whole plants of Stephania hernandifolia by various column chromatographic methods. Their structures were identified by physicochemical properties and spectral analyses. Compounds 2 and 3 were isolated from the genus of Stephania for the first time.