Two new labdane-type diterpenes from the wood of Cunninghamia konishii

Two new labdane-type diterpenoids, (12S,13S)-12,13-epoxy-8(17),14-labdadien-18-ol (1) and (12S,13S)-12,13-epoxy-8(17),14-labdadien-19-oic acid (2), along with four known labdane-type diterpenoids were isolated from the wood of Cunninghamia konishii. Their structures were determined by analysis of spectroscopic data and comparison with the data of known analogues.