Triterpenoids from Psidium Guajava Leaves

Abstract

Three pentacyclic triterpenoids including one new guajavanoic acid ( 2 ) and two known obtusinin ( 1 ) and goreishic acid I ( 3 ) have been isolated from the leaves of Psidium guajava . The new constituent 2 has been characterized as 2 f -hydroxy-3 g - p-E -coumaroyloxyurs-12, 18-dien-28-oic acid through 1 H-NMR and 13 C-NMR (broad band and DEPT). This is the first report of isolation of compound 1 and 3 from the genus Psidium .