Abstract: Four new dammarane type triterpenoids, named (20R, 24R) - epoxy - 25 - dammaren - 3 - one;16 β - hydroxy - dammara - 20(22), 25 - dien - 3 - one(4) ; 26 - hydroxy - dammara - 20, 24 - dien - 3 -one(5); 7α,21S, 25 - trihydroxy - 3β - acetoxy - 21S, 23R - epoxy - 9( 11) - en - dammarane(8) together with four known compounds, ergosterol peroxide, dammara - 20, 24 - dien - 3 β - ol, 20 - R - form hydroxy -dammaranone and cycloart -23 -ene -3 (3, 25 -diol were isolated from the leaves of Dysoxylum hongkongense. The proposed structures were established by spectral analysis and comparisons with closely related compounds.

Key words: Dysoxylum hongkongense , 26 - hydroxy - dammara