The bioactive molecule 2H-Furo[2,3-H] has antibacterial action. At concentrations of 100-1000ppm, -1-benzopyran-2-one was tested against five human bacterial species: Klebsiella pneumoniae, Vibrio cholerae, Escherichia coli, Shigella dysenteriae, and Salmonella typhi. K. pneumonia showed 32.0mm inhibition at 700mm concentration, the highest of the five bacteria examined (MIC 700ppm). At 600ppm...