The Vasorelaxant Activity of Marrubenol and Marrubiin from Marrubium vulgare - El Bardai, Sanae; Morel, Nicole; Wibo, Maurice; Fabre, Nicolas; Llabres, Gabriel; Lyoussi, Badiaa; Quetin-Leclercq, Joëlle (Planta Medica, 2003)