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What is the precursor of penicillin?

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What is the precursor of penicillin?

(a) Benzylpenicillin

(b) Isopenicillin N

(c) phenylacetic acid

(d) L-α aminoadipic acid

This question was addressed to me in examination.

Query is from Production of Antibiotics (Isolation of Fermentation Products) topic in division Antibiotics & Enzyme Immobilization of Drug Biotechnology

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Correct option is (c) phenylacetic acid

Easiest explanation: Benzylpenicillin (Penicillin G) is a narrow spectrum antibiotic used to treat infections caused by some bacteria. It is a natural penicillin antibiotic administered intravenously or intramuscularly. Penicillin G may also be used in cases such as prophylaxis against susceptible organisms.

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