The 13C n.m.r. spectrum of ochratoxin A has been assigned. The distribution of 13C label and of intact acetate units, as determined from the 13C n.m.r. spectra of ochratoxin A derived from singly and doubly labelled [13C]acetate, defines the biosynthetic origin of the 3,4-dihydro-(3R)-methylisocoumarin moiety unequivocally.
A. E. de Jesus, P. S. Steyn, R. Vleggaar and P. L. Wessels, J. Chem. Soc., Perkin Trans. 1, 1980, 52 DOI: 10.1039/P19800000052
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