<prompt> All drug inhibit bacterial cell wall synthesis EXCEPTSpectinomycinVancomycinAztreonamCephalexin  <response>: Spectinomycin is an aminocyclitol antibiotic that inhibits bacterial protein synthesis. The other drugs all inhibit bacterial cell wall synthesis. Vancomycin and bacitracin inhibit early steps in the biosynthesis of the peptidoglycan component of the cell wall, whereas 3-- lactams such as aztreonam a monobactam, penicillins, cephalosporins, and carbapenems inhibit the cross-linking transpeptidation of the cell wall peptidoglycan polymers. 