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Template:Beta-lactam core structures

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PenamCarbapenamOxapenamPenemCarbapenemMonobactamCephemCarbacephemOxacephem
The β-lactam core structures. (A) A penam. (B) A carbapenam. (C) An oxapenam. (D) A penem. (E) A carbapenem. (F) A monobactam. (G) A cephem. (H) A carbacephem. (I) An oxacephem.