It has been shown that tryptophan is not utilized in a cell-free system of Penicillium cyclopium; α-acetyl-γ-(β-indolyl)methyltetramic acid, a biosynthetic intermediate of the cyclopiazonic acids, has been identified, and the L-configuration at the asymmetric centre of the new indole established.
R. M. McGrath, P. S. Steyn and N. P. Perreira, J. Chem. Soc., Chem. Commun., 1973, 812 DOI: 10.1039/C39730000812
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