Isolation and Structure of Neriucoumaric and Isoneriucoumaric Acids from the Leaves ofNerium oleander

Abstract
Two new coumaryloxy triterpenoids, neriucoumaric and isoneriucoumaric acids, have been isolated from fresh, undried and uncrushed leaves of Nerium oleander and their structures established as 3β-hydroxy-2α-cis-p-coumaryloxy-urs-12-en-28-oic acid and 3β-hydroxy-2α-trans-p-coumaryloxy-urs-12-en-28-oic acid respectively, through chemical and spectroscopic methods.