This chemical is widely used in peptide synthesis as a building block. It serves as a protected form of aspartic acid, ensuring specific reactions occur at desired sites without interference. The Boc (tert-butyloxycarbonyl) and OtBu (tert-butyl ester) groups protect the amino and carboxyl functionalities, respectively, during the synthesis process. This allows for controlled step-by-step assembly of peptide chains. It is particularly valuable in solid-phase peptide synthesis (SPPS), where selective deprotection and coupling are essential. Its application ensures high purity and efficiency in producing complex peptides for research, pharmaceuticals, and biotechnology.