title: [The replacement of oxygen in the lactone ring of cardenolides by nitrogen (proceedings)].
mesh_terms: D000818:Animals; D002298:Cardenolides / Q000138:chemical synthesis* / Q000494:pharmacology; D006168:Guinea Pigs; D066298:In Vitro Techniques; D007783:Lactones / Q000138:chemical synthesis* / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D009584:Nitrogen; D010100:Oxygen
chemical_list: D002298:Cardenolides; D007783:Lactones; D009584:Nitrogen; D010100:Oxygen
vernacular_title: Uber den Ersatz des Ringsauerstoffs im Lactonring der Cardenolide durch Stickstoff.