Source:http://linkedlifedata.com/resource/umls/id/C1154675
GO: The chemical reactions and pathways resulting in the formation of a beta-lactam antibiotic, any member of a class of natural or semisynthetic antibiotics whose characteristic feature is a strained, four-membered beta-lactam ring. They include the penicillins and many of the cephalosporins. [GOC:mah, ISBN:0198506732]