Planta Med 2003 Jan;69(1):75-7 The Vasorelaxant Activity of Marrubenol and Marrubiin from Marrubium vulgare. El Bardai S, Morel N, Wibo M, Fabre N, Llabres G, Lyoussi B, Quetin-Leclercq J. Laboratoire de Pharmacognosie, Universite catholique de Louvain, Brussels, Belgium. Crude extracts of the aerial parts of Marrubium vulgare show a potent in vitro inhibition of KCl-induced contraction of rat aorta. Bio-guided fractionations, spectroscopic analysis and chemical derivatization revealed the furanic labdane diterpenes marrubenol and marrubiin as the most active compounds. PMID: 12567286 [PubMed - in process]