Used primarily in the development of antibody-drug conjugates (ADCs), this compound serves as a linker-payload component. It enables the targeted delivery of cytotoxic agents to specific cells, particularly in cancer therapy. The PEG4 spacer enhances solubility and stability, while the pomalidomide moiety exerts its therapeutic effect by modulating the immune system and inducing apoptosis in malignant cells. The hydrochloride salt form ensures better handling and storage properties. This chemical is valuable in research and pharmaceutical applications for designing more effective and precise cancer treatments.