N- (4-Anilino-1-naphthyl) maleimide

N- (4-Anilino-1-naphthyl) maleimide is a thiol-reactive fluorescent probe used to label protein cysteine residues. It forms a stable adduct with excitation/emission maxima at 355/448 nm, applicable for in vitro protein analysis and thiol quantification assays in biochemical research.