Three labdane-type diterpenes from the bark of Juniperus formosana HAY. var. concolor HAY.

Abstract

Three new labdane-type diterpenes, (13S)-15-hydroxylabd-8(17)-en-19-oic acid, (13S)-15-acetoxylabd-8(17)-en-19-oic acid, and (13S)-15- octadecanoyloxylabd-8(17)-en-19-oic acid, together with one known compound, enantio-oliveric acid, were found from the hark of Juniperus formosana HAY. var. concolor HAY. Their structures were elucidated on the basis of spectral data and chemical transformation.