G.c.–m.s. analysis of the methyl ester of [18O]-penicillin V obtained on incubating Penicillium chrysogenum mycelium with L-[18O2] valine demonstrated the elimination of one of the two carboxy-oxygen atoms.
J. S. Delderfield, E. Mtetwa, R. Thomas and T. E. Tyobeka, J. Chem. Soc., Chem. Commun., 1981, 650 DOI: 10.1039/C39810000650
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