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Ureidopenicillin   The ureidopenicillins are a group of penicillins which are active against Pseudomonas aeruginosa.[citation needed] There are three ureidopenicillins in clinical use:[1] They are mostly ampicillin derivatives in which the amino acid side chain has been converted to a variety of cyclic ureas. It is speculated that the added side chain mimics a longer segment of the peptidoglycan chain, more than ampicillin, and thus would bind more easily to the penicillin-binding proteins. Ureidopenicillins are not resistant to beta-lactamases.[citation needed] They are used parenterally, and are particularly indicated in infections caused by Gram-negative bacteria.[citation needed] References
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