Used in organic synthesis as an intermediate for fluorescent probes and bioactive molecules. Its bromoacetyl group allows easy attachment to nucleophiles like amines or thiols, making it useful in labeling biomolecules. Commonly applied in the development of fluorescent sensors for metal ions and small molecules due to coumarin’s strong emission properties. Also investigated for use in photodynamic therapy and as a building block in pharmaceuticals with antimicrobial or anticancer activity.