[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][Branch1][S][C][=Branch1][C][=O][N][Ring1][Branch1][S][=Branch1][C][=O][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C][=Branch1][#C][=N][O][C][Branch1][C][C][Branch1][C][C][C][=Branch1][C][=O][O][C][=C][S][C][=Branch1][Ring2][=N][Ring1][Branch1][N]"}, {"from": "gpt", "value": "The molecule is a monocyclic beta-lactam antibiotic originally isolated from Chromobacterium violaceum with bactericidal activity. Aztreonam preferentially binds to and inactivates penicillin-binding protein-3 (PBP-3), which is involved in bacterial cell wall synthesis, thereby inhibiting bacterial cell wall integrity and leading to cell lysis and death. This agent differs from other beta-lactam antibiotics because it is resistant to beta-lactamase hydrolysis, and it is usually used to treat infections caused by gram-negative aerobic microorganisms."}]