The aminopenicillins are a group of antibiotics in the penicillin family that are structural analogs of ampicillin (which is the 2-amino derivative of benzylpenicillin, hence the name). Like other penicillins they contain a beta-lactam ring that is believed to be crucial to its antibacterial activity.
Aminopenicillins feature a positively charged amino group that enhances their uptake through bacterial porin channels. This does not, however, confer resistance to bacterial beta-lactamases. Members of this family include ampicillin, amoxicillin and bacampicillin.