Antimicrobial Activities. -A simple, rapid and practical method allows the sulfurization and oxidation of 1,4-dihydropyridinones to thiones (II). The latter compounds are more potent against E. coli and K. pneumoniae than the standard drug ciprofloxacin. -(MOURAD, A.-F. E.; ALY*, A. A.; FARAG, H. H.; RADWAN, M. F.; BESHR, E. A.; J. Chem.