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Medical Definition of Penin
1. 6-Aminopenicillanic acid (NH2 replacing RCONH-in penicillin); an intermediate in the synthesis of penicillins. (05 Mar 2000)
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1. 6-Aminopenicillanic acid (NH2 replacing RCONH-in penicillin); an intermediate in the synthesis of penicillins. (05 Mar 2000)