Two triterpenoid lactones from the resin of Bursera delpechiana
摘要:
Two new triterpenoid lactones have been isolated from the resin of Bursera delpechiana and their structures assigned as 3 beta-acetoxy-11 alpha, 12 alpha-epoxyurs-28,13-olide and 3 beta-acetoxy-12 beta-hydroxyurs-28,13-olide respectively on the basis of their spectroscopic properties and chemical evidence.