A new ent-kaurane diterpenoid from Isodon eriocalyx / 中草药

To study the chemical constituents from the stems and leaves of Isodon eriocalyx. Methods The chemical constituent of I. eriocalyx was separated and purified by chromatographic methods and structurally elucidated by physicochemical characteristics and spectral data. Results One new compound was isolated from the stems and leaves of I. eriocalyx, and it was identified as 15β-acetoxy-1α-hydroxy-7α,20-epoxy-ent-kaur-16-en-6-one (1). Conclusion Compound 1 is a new ent-kaurane diterpenoid named as eriocalyxin H.