... European Journal of Medicinal Chemistry. ... a Department of Medicinal Chemistry, Faculty of Pharmacy, Tehran ... Table 5. In vitro antibacterial activities of 3(2H)-isothiazolones 5a–j, 5s and 6a–r and standard drugs gentamycin, ceftazidime, ceftriaxone, ciprofloxacin (MIC in μg/ml). ...