The 13C n.m.r. analysis of [1-13C]butyrate derived antibiotic X-537 A has clearly established butyric acid as the biosynthetic precursor of all three C-ethyl groups in the molecule.
J. W. Westley, D. L. Pruess and R. G. Pitcher, J. Chem. Soc., Chem. Commun., 1972, 161 DOI: 10.1039/C39720000161
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