Used in solid-phase peptide synthesis, this compound enables selective protection of amino groups in multi-step peptide constructions. The Mtt (4-methyltrityl) group provides acid-labile protection that can be removed under very mild acidic conditions, allowing orthogonal deprotection strategies when building complex peptides with multiple functional groups. The Fmoc group offers base-labile protection, compatible with standard Fmoc-SPPS protocols. This dual protection scheme is particularly useful for synthesizing branched peptides, cyclic peptides, or post-translationally modified proteins where side-chain amines must be selectively deprotected for further coupling or modification. Its application is critical in the preparation of peptide-based drugs, bioconjugates, and chemical probes requiring precise control over reactivity and sequence.