thumb|right|450px|From left to right, the above are general structures of β-lactam, a [[γ-lactam, a δ-lactam, and ε-lactam. Their common names are β-propiolactam, γ-butyrolactam, δ-valerolactam, and ε-caprolactam.]]
thumb|right|450px|From left to right, the above are general structures of β-lactam, a [[γ-lactam, a δ-lactam, and ε-lactam. Their common names are β-propiolactam, γ-butyrolactam, δ-valerolactam, and ε-caprolactam.]]
A lactam is a cyclic amide, formally derived from an amino carboxylic acid through cyclization reactions. The term is a portmanteau of the words lactone + amide.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).