A class of antibiotics that contain a β-lactam ring in their molecular structure, which is essential for their antibacterial activity
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(6S,7S)-3-Acetoxymethyl-7-(2-amino-2-phenyl-acetylamino)-8-oxo-4-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid; hydrochloride
sodium (R)-[(3-ethoxy-1-methyl-3-oxoprop-1-enyl)amino]phenylacetate
3-(3-dimethylamino-phenyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester
