Taibaihenryiin C, a diterpenoid with a novel skeleton from Isodon henryi

A diterpenoid with a novel skeleton, taibaihenryiin C, along with four known compounds, odonicin, rabdosianin B, wikestroemioidin C and eupafolin were isolated from an ethanol extract of the leaves and new branches of Isodon henryi (Hemsl.) Kudo (Labiatae) and its structure was elucidated on the basis of spectroscopic data and X-ray crystallography.