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In page Cefotaxime:

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Unlike β-lactams such as penicillin and amoxicillin, which are highly susceptible to degradation by β-lactamase enzymes (produced, for example, nearly universally by S. aureus), cefotaxime boasts the additional benefit of resistance to β-lactamase degradation due to the structural configuration of the cefotaxime molecule. The syn-configuration of the methoxyimino moiety confers stability against β-lactamases.[3] Consequently, the spectrum of activity is broadened to include several β-lactamase-producing organisms (which would otherwise be resistant to β-lactam antibiotics), as outlined below.[citation needed]