Abstract
Marrusidins A (1) and B (2), two new labdane-type diterpenes, were isolated from the CHCl(3)-soluble subfraction of Marrubium anisodon, along with polyodonine. Their structures were assigned with the aid of (1)H- and (13)C-NMR spectra and by COSY, HMQC, NOESY, and HMBC experiments.