– 7-Diethylamino-3-N-(4-maleimidopropyl)carbamoylcoumarin is a versatile dye utilized across various fields. This compound is primarily important in biological experiments for observing and analyzing cell structures, tracking biomolecules, evaluating cell functions, distinguishing cell types, detecting biomolecules, studying tissue pathology, and monitoring microorganisms. Its applications extend beyond basic scientific research into clinical diagnostics. Additionally, it is employed in traditional industries like textile dyeing and in innovative areas including functional textile processing, food pigments, and dye-sensitized solar cells.