violacein
violacein
A member of the class of hydroxyindoles resulting from the formal oxidative coupling between the 3-position of 1,3-dihydro-2<em>H</em>-indol-2-one and the 3-position of 1,3-dihydro-2<em>H</em>-pyrrol-2-one, which is substituted at the 5 position by a 5-hydroxy-1<em>H</em>-indol-3-yl group, where the newly-formed double bond has <i>E</i> configuration. It is a purple chromobacterial pigment that has antibacterial, antifungal, antiprotozoan, and anticancer properties.