Penams are a subclass of the broader β-lactam family of antibiotics and related compounds. Penams contain a β-lactam ring fused to a 5-membered ring, where one of the atoms in the ring is a sulfur and the ring is fully saturated.[1] Penicillin is a member of this family of compounds (hence the name of the family).


  1. Dalhoff, A.; Janjic, N.; Echols, R. (2006). "Redefining penems". Biochemical Pharmacology. 71 (7): 1085–1095. doi:10.1016/j.bcp.2005.12.003. PMID 16413506.

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