The Penicillin derivatives reference article from the English Wikipedia on 24-Jul-2004
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Penicillin derivatives

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Other antibiotics derived from Penicillin include the following:

Aminopenicillins

Extended Spectrum Penicillins Penicillinase-resistant Penicillins Beta-lactamase Inhibitors

Penicillin itself has different forms, including Penicillin G and Penicillin V.