Used primarily as an intermediate in the synthesis of pharmaceutical compounds, especially in the development of antitumor agents. Its reactive chloroethyl groups enable cross-linking with DNA, making it valuable in the design of alkylating agents for cancer therapy. Also employed in research settings to develop novel derivatives with potential biological activity. Due to its aldehyde functionality, it can undergo condensation reactions to form Schiff bases, which are explored for their pharmacological properties. Handle with care due to potential toxicity and mutagenic risk.