Marrusidins A and B, New Epimeric Labdane Diterpenes from <i>Marrubium anisodon</i>

Abstract

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.