The incorporation of (2RS)-[indole-2-13C, 2-15N]tryptophan into both roquefortine and oxaline, and the efficient conversion of roquefortine into oxaline, defines a biosynthetic pathway by which N-14 of oxaline is from N-5 of roquefortine (and thus from tryptophan) and not from an exogenous nitrogen source.
P. S. Steyn and R. Vleggaar, J. Chem. Soc., Chem. Commun., 1983, 560 DOI: 10.1039/C39830000560
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