Boc-NH-PEG4-C2-Boc is widely used in the field of bioconjugation and drug delivery due to its PEG (polyethylene glycol) spacer, which enhances solubility and reduces immunogenicity. It serves as a versatile linker in peptide synthesis, enabling the attachment of bioactive molecules while protecting functional groups during reactions. This compound is particularly valuable in the development of antibody-drug conjugates (ADCs), where it facilitates the stable connection between antibodies and cytotoxic agents, improving therapeutic efficacy. Additionally, it is employed in the synthesis of prodrugs and other targeted delivery systems, providing a stable spacer for conjugation. Its dual Boc protection ensures selective deprotection, making it a reliable tool in complex organic synthesis.