Used as a protected amino acid derivative in peptide synthesis, particularly in the preparation of complex peptides where selective deprotection is required. The trichloroethoxy carbonyl (Troc) group serves as a protecting group for the carboxylic acid functionality, allowing orthogonal protection strategies in multi-step syntheses. It is stable under various reaction conditions but can be selectively removed using mild reducing agents like zinc in acetic acid, enabling controlled assembly of peptide chains without affecting other protecting groups. Its use is common in solid-phase and solution-phase peptide synthesis for pharmaceutical and biochemical research.