δ-(L-α-Aminoadipoly)-L-cysteinyl-N-hydroxy-D-valine (3a) has been prepared from the appropriately protected amino acids; (3a) was not converted into isopenicillin N (2) using a cell-free from Cephalosporium acremonium but inhibited the formation of (2) from δ-(L-α-aminoadipoyl)-L-cysteinyl-D-valine (1) by this system.
R. L. Baxter, G. A. Thomson and A. I. Scott, J. Chem. Soc., Chem. Commun., 1984, 32 DOI: 10.1039/C39840000032
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