Used primarily as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other biologically active molecules. Its iodine functionality allows for further functionalization via cross-coupling reactions such as Suzuki or Heck couplings, making it valuable in medicinal chemistry for building complex heterocyclic systems. It is also employed in the preparation of analogs for structure-activity relationship (SAR) studies due to its rigid, fused ring structure that can mimic peptide motifs or influence binding affinity in drug targets.