Aztreonam
Aztreonam (trade name Azactam) is a synthetic monocyclic beta-lactam antibiotic (a monobactam) originally isolated from Chromobacterium violaceum. It was approved by the U.S. Food and Drug Administration (FDA) in 1986. It is resistant to some beta-lactamases, but is inactivated by extended-spectrum beta-lactamases.