Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. It serves as a building block in medicinal chemistry due to its reactive aldehyde group and heteroaromatic structure, enabling coupling reactions and ring formations. Also employed in agrochemical research for designing novel pesticides with targeted activity. Its chloropyridazine moiety contributes to enhanced binding affinity in biological systems, making it valuable in structure-activity relationship studies.