Used in solid-phase peptide synthesis, this compound enables selective protection of amino groups in complex peptide sequences. The Mtt (4-methyltrityl) group provides orthogonal protection, allowing stepwise assembly of peptides with multiple lysine or diaminopropionic acid residues. Its Fmoc group ensures compatibility with standard Fmoc-strategy protocols, facilitating mild base deprotection while keeping the Mtt group intact. This selective deprotection is critical for synthesizing branched peptides, cyclic structures, or conjugating payloads like fluorescent tags, lipids, or drugs at specific sites. Commonly applied in the development of peptide-based therapeutics, diagnostics, and biochemical probes where precise side-chain functionalization is required.