The objectives of the thesis: Study on the chemical compositions of three species: Allophylus livescens, Chirita halongesis and Oldenlandia pinifolia growing in Viet Nam to find bioactive compounds as the basis for further research. | Summary of doctoral thesis: Study on chemical constituents and cytotoxic activity of 3 species allophylus livescens gagnep, chirita halongensis kiew& and oldenlandia pinifolia (wall. ex ) kuntze] in Viet Nam