Lactams

Part of speech: noun

Definitions

1. Compounds that feature a cyclic amide structure crucial for their antibacterial activity against various pathogens
2. Chemical substances containing a ring structure with nitrogen and carbon that play a significant role in the development of numerous antibiotic drugs
3. Cyclic amides characterized by a nitrogen atom within a ring, known for their importance in the synthesis of a wide array of pharmaceutical agents

Etymology: Milk is the root of this word. "Lact-" comes from Latin "lac," and it entered chemistry through lactic acid, which the Swedish chemist Carl Wilhelm Scheele isolated from sour milk. Chemists later used that stem to name whole families of ring compounds. The name is a blend of "lactone" and "amide." Lactones are cyclic esters, and lactams are their nitrogen counterparts: the ring oxygen is replaced by a nitrogen atom, which is what makes them cyclic amides. The "-am" ending is taken from "amide," so the name records both the milk-derived ring and the nitrogen it contains.