Used in the synthesis of peptide-based drugs, this Boc-protected PEG4 acid compound serves as a crucial intermediate, featuring a tert-butoxycarbonyl (Boc) group for amino protection to prevent unwanted reactions during peptide chain assembly. It is particularly valuable in biocompatible polymer synthesis and drug delivery systems, where it facilitates the controlled release of therapeutic agents. The compound is also employed in the development of hydrogels for tissue engineering and regenerative medicine. Its application extends to surface modification to enhance biocompatibility in medical devices. Additionally, it plays a role in the production of targeted cancer therapies, aiding in the conjugation of drugs to specific carriers for precise delivery.