Abstract The synthesis and characterization of a series of 4-substituted phenyl-4, 5- dihydrobenzo [f][1, 4] oxazepin-3 (2H)-thiones were presented. Preliminary in vitro antimicrobial activity of the compounds was assessed against a panel of microorganisms including S. aureus, E. faecalis, P. aeruginosa, E. coli, and C. albicans. Some of the compounds exhibited significantly in vitro antimicrobial activity. The p MIC values were ...