Provided are compounds and compositions derived from Pseudomonas sp., particularly, Pseudomonas fluorescens or Pseudomonas protegens and more particularly a strain having the identifying characteristics of Pseudomonas ATCC 55799 having anti-microbial properties and particularly, antibacterial properties.本發明提供取自假單胞菌之化合物及組成物,具體而言,該化合物及組成物係取自螢光假單胞菌(Pseudomonas fluorescens)或保護假單胞菌(Pseudomonas protegens),且更具體而言,化合物及組成物係取自一菌株,其具有富微生物抗性之假單胞菌ATCC 55799之識別特性,且所謂抗微生物性質尤其是指抗菌性質。