Used in peptide synthesis as a protected intermediate, particularly in the preparation of sialic acid derivatives. The Fmoc group provides orthogonal protection for the amino function, allowing selective deprotection under mild basic conditions, while the acetamido and carboxylic acid groups can be further modified. Its structure enables controlled coupling reactions in solid-phase synthesis, making it valuable in glycochemistry and the development of complex carbohydrate-containing biomolecules.