Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its aldehyde and ethynyl functional groups allow for selective coupling reactions, such as Sonogashira and Wittig reactions, enabling the construction of complex molecular architectures. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its ability to enhance binding affinity and metabolic stability in drug candidates. Also utilized in the preparation of fluorescent probes and bioconjugates for imaging and diagnostic applications.