The titled compound (1b), the first naturally occurring, sulphur-containing dioxopiperazine unsubstituted on nitrogen, has been isolated from Aspergillus terreus and synthesised via the corresponding epidisulphide (2d), which has been tested as a biosynthetic precursor of bisdethiobis(methylthio)acetylaranotin (3).
G. W. Kirby, D. J. Robins and W. M. Stark, J. Chem. Soc., Chem. Commun., 1983, 812 DOI: 10.1039/C39830000812
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