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Phomopsin A (PHO-A), produced by the fungus Diaporthe toxica, is a mycotoxin known to be responsible for fatal liver disease of lupin-fed sheep. The füll spectrum of the toxic secondary metabolites produced by D. toxica is still unknown. PHO-A and the naturally occurring derivatives B—E have been subject to several studies to reveal their structures as well as chemical and toxicological properties. In this work, a methylated derivative of PHO-Aisolated firom lupin seeds inoculated %vith D. toxica is described. It was characterized by high-resolution mass and NMR data and shown to be the N-methylated derivative of PHO-A 1 is cytotoxic againstHepG2 cells.