Objective: To investigate the chemical constituents of the brown alga D.divaricata,and to test cytotoxicities of the purified compounds.Method: Compounds were isolated by normal phase silica gel,Sephadex LH-20 chromatography and reverse phase HPLC techniques.Their structures were elucidated by spectroscopic methods including IR,MS and NMR.Cytotoxicities were tested by MTT method.Result: Eight compounds were isolated from ethanolic extract of the brown alga D.divaricata and their structures were identified a...