Used in bioconjugation and pharmaceutical development, this PEGylated linker enhances solubility and stability of peptide and protein-based drugs. Its t-Boc protected amine allows for selective deprotection and sequential coupling in solid-phase synthesis, making it valuable in constructing complex biomolecules. The long PEG12 spacer reduces steric hindrance, improving binding efficiency in targeted therapies and diagnostic probes. Commonly employed in the development of antibody-drug conjugates (ADCs), peptide-drug conjugates, and functionalized nanoparticles for controlled drug delivery. Also useful in creating biocompatible surfaces for biosensors and medical devices.