Abstract
The assignment of structure (1) to fusarin C, a mutagen isolated from cultures of Fusarium moniliforme is based on a detailed study of its high-field 1H and 13C n.m.r. spectra and X-ray crystallography of the 8Z isomer of (1) which defined the substitution pattern and relative configuration of the 2-pyrrolidone moiety; nuclear Overhauser enhancement experiments indicate that the 2E,4E,6E,8E,10E polyene chromophore of (1) exists in solution as an equilibrium between two conformers with s-cis and s-trans topology of the C-5–C-6 single bond.
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