title: Pyrrolizidine ester alkaloid in danaid butterflies.
mesh_terms: D000818:Animals; D002849:Chromatography, Gas; D007313:Insecta / Q000032:analysis*; D010675:Pheromones / Q000302:isolation & purification*; D011763:Pyrrolizidine Alkaloids / Q000302:isolation & purification*
chemical_list: D010675:Pheromones; D011763:Pyrrolizidine Alkaloids