The oxazolidinones, exemplified by DuP 721 (l), are a relatively new class of orally active, totally synthetic antibacterial agents. 2 Their spectrum of activity encompasses Gram- positive aerobic bacteria, including methicillin-resistant Staphylococcw aureus (MRSA), and anaer-obic organism^.^ Preliminary inquiries into the mechanism of action of the oxazolidinones revealed that they are bacterial protein synthesis inhibitors, with inhibition ...