Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), as a building block. The Fmoc group protects the amino group during the synthesis process, allowing for selective deprotection and elongation of the peptide chain. Its cyclopropyl side chain introduces structural rigidity, which can be beneficial in designing peptides with specific conformational properties. This compound is valuable in creating bioactive peptides, peptidomimetics, and in drug discovery research where modified amino acids are needed to enhance stability, activity, or binding affinity.