Anhydropenicillin V is transformed by Aspergillus niger, Penicillum chrysogenum, and other fungi into the thiopeptide, phenoxyacetylthioglycyl-(±)-valine (IIIa); the simultaneous formation of trace amounts of penicillin V is probably due to a spontaneous rather than an enzyme-catalysed rearrangement.
R. Thomas, J. Chem. Soc., Chem. Commun., 1972, 478 DOI: 10.1039/C39720000478
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