An antibacterial constituent, has been isolated from Ficus deltoideus Jack leaves. Based on spectroscopic data (IR, 'H-NMR, 13C NMR 10 and 20 and MS), the structure of this compound was identified as 0Iean-12en-313-01, (jl-amyrin), C30HSOO. This compound showed antibacterial activities against E. coli, B. subtilis and 5, aureus. The minimum inhibition concentration (MIC) agains E, coli, B, subt…