Isolation and Structural Identification of a New Metabolite of Fusarium equiseti.

A fluorescent compound was isolated and purified from rice cultures of Fusarium equiseti (Alaska 2-2). Mass spectrometry and nuclear magnetic resonance data indicated that its structure is 2,2-dimethyl-5-amino-6-(3'-hydroxyl-4'-methoxyl-butyryl)-4-chromone. It is an analog of the mycotoxin fusarochromanone, in which the amino group on C-3' is replaced by a hydroxyl group and the hydroxyl group on C-4' is replaced by a methoxyl group.