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A member of a chemical family including dopamine, noradrenaline and adrenaline, characterized by a catechol ring and an amine-containing side chain. Their signaling effects depend on receptor type and location rather than chemical-family membership alone.

A beta-lactam antibiotic whose activity involves inhibition of bacterial cell wall synthesis. Penicillin also names a broader chemical family, so a particular formulation or derivative should be specified when its properties matter.