It produced a particularly large inhibition zone in tests using E.coli 0157 H7 (17 mm). E2 and E1 exhibited intermediate activity, and E5 was the least active of the EtOAc fractions (Table 2). The most active fraction (H3) was further investigated to isolate the bioactive compound(s) and the active principle was characterised. The structure was confirmed based on spectroscopic tools and comparison with literature data (Figure 1) (Rˇ ezanka & Dembitsky 2001). Terpenoid compound was identified as (5S)-3-[(3E,5S)-5- hydroxy-3-hepten-6-yn-1-yl]-5-methyl-2(5H)-furanone (Figure 3).