Used in peptide synthesis and bioconjugation, this compound features an aldehyde (Ald) group attached to a phenyl-amido-C2 linker, a PEG3 spacer, and a Boc-protected amine (NH-Boc). The Boc serves as a protective group for amines, enabling selective reactions in complex molecular structures. The aldehyde allows for site-specific conjugation with nucleophiles like hydrazides or amines. It is particularly valuable in the development of peptide-based drugs, where it helps maintain the integrity of functional groups during synthesis. The PEG spacer enhances solubility and reduces steric hindrance, facilitating efficient coupling reactions. Additionally, it is employed in the preparation of targeted drug delivery systems, where the Boc group can be selectively removed to expose the amine for further functionalization. Its applications extend to the creation of biomaterials and probes for biochemical research, aiding in the study of molecular interactions and cellular processes.