Abstract
The complete assignment of the natural abundance 13C n.m.r. spectrum of citreoviridin, a mycotoxin produced by Penicillium pulvillorum CSIR 1406, allowed a study of its biosynthetic origin using 13C-labelled precursors. The results show that citreoviridin is derived from a C18-polyketide formed from an acetate chain-starter unit and eight malonate units. The five remaining carbon atoms, i.e. the five methyl groups, are derived from (2S)-methionine.
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