The benzene/ethanol extractives of Eucalyptus camaldulensis biomass were identified by Py-GC/MS to find out biomedical application. The main 350°? pyrolysis components were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a- octahydro-1,4a-dimethyl-7-(1-methylethyl)-(21.22%), .beta.-sitosterol acetate (6.4%), stigmasterol, 22,23-dihydro-(5.87%), ergosta-4,6,22-trien-3.beta.-ol(3. 6%), etc. The main 350°? pyrolysis components were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)-(23.58%), ergosta-4,6,22-trien- 3.alpha.-ol(6.27%), decanoic acid...