The Heart Glycosides of the Arrow Poison ofLophopetalum toxicumLOHERFrom the cytotoxic and positive inotropic acting bark extract of the PhilippinanLophopetalum toxicumeight heart glycosides have been isolated and their structures have been elucidated mainly by field‐desorption‐MS‐ and1‐ and13C‐NMR spectroscopy. Besides the known k‐Strophanthidin (1), Antiarigenin (6) and β‐Antiarin (Antiarigenin‐3‐β‐O‐α‐L‐rhamnoside,10) the following mono‐ and diglycosides could be identified: strophanthidin‐3‐β‐O‐α‐6‐desoxy‐D‐allopyranoside (strophalloside,2), strophanthidin‐3‐β‐O‐β‐6‐desoxy‐D‐glucopyranoside (= Strophanthidin chinovoside,3), strophanthidin‐3‐β‐O[‐4Oβ‐D‐allopyranosyl‐β‐6‐desoxy‐D‐allopyranoside] (4), strophanthidin‐3‐β‐O‐[3‐O‐β‐D‐glucopyranosyl‐β‐6‐desoxy‐D‐talopyranoside] (5), antiarigenin‐3‐β‐O‐[3‐O‐β‐D‐gulopyranosyl‐β‐6‐desoxy‐D‐talopyranoside] (7), antiarigenin‐3‐β‐O‐[4O‐β‐D‐allopyranosyl‐β‐6‐desoxy