Used as an intermediate in the synthesis of functional dyes, particularly near-infrared (NIR) cyanine dyes for bioimaging and photodynamic therapy. Serves in the preparation of phthalocyanine derivatives, which are applied in organic semiconductors, photovoltaic devices, and as photosensitizers in cancer treatment. Also utilized in the development of fluorescent probes for detecting biomolecules due to its favorable photophysical properties. Its methoxy group enhances solubility and electron-donating effects, improving performance in optoelectronic applications.