Penicillins

**Definition:** A group of antibiotics that contain 6-aminopenicillanic acid with a side chain attached to the 6-amino group. The penicillin nucleus is the chief structural requirement for biological activity. The side-chain structure determines many of the antibacterial and pharmacological characteristics. (Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p1065)

**Tree numbers:** - D02.065.589.099.750 - D02.886.108.750 - D03.633.100.300.750

**Synonyms:** - Antibiotics, Penicillin