BODIPY 630/650 Maleimide is a far-red fluorescent probe and the maleimide derivative of BODIPY 630/650. The maleimide group enables covalent conjugation with thiol (-SH) groups on proteins, peptides, and other biomolecules, forming stable thioether bonds for site-specific labeling. This dye features high quantum yield, narrow emission peak, and excellent photostability. Its far-red emission reduces interference from biological autofluorescence, making it widely used for protein labeling, cellular imaging, and multichannel fluorescence analysis.