Chemical constituents from the leaves of Psidium guajava

Five constituents including one new pentacyclic triterpenoid guajanoic acid ( 1) and four known compounds beta-sitosterol ( 2), uvaol ( 3), oleanolic acid ( 4), and ursolic acid ( 5) have been isolated from the leaves of Psidium guajava. The new constituent 1 has been characterized as 3 beta-p-E-coumaroyloxy-2alpha-methoxyurs-12-en-28-oic acid through 2D NMR techniques and chemical transformations. This is the first report of isolation of compound 3 from the genus Psidium.