Triterpenoids from the Leaves of Eucalyptus camaldulensis var. obtusa

An investigation on the constituents of the fresh, uncrushed leaves of Eucalyptus camaldulensis var. obtusa has led to the isolation of three new and one known triterpenoids. The new products were characterized by chemical and spectroscopic studies as camaldulic acid (20β-acetoxy-3β-hydroxyurs-12-en-28-oic acid) ( 1 ), camaldulensic acid (3β,30-dihydroxy-11α-methoxyurs-12-en-28-oic acid) ( 2 ) and camaldulenic acid (2α,3β-dihydroxyolean-11,13(18)-dien-28-oic acid) ( 3 ), whereas the known compound was identified as ursolic acid lactone (3β-hydroxyurs-11-en-13β(28)-olide).