Fmoc-L-aspartic Acid β-tert-butyl Ester is Fmoc protected L-Aspartic Acid 4-tert-Butyl Ester (A788930) which is a protected form of L-Aspartic acid (A790024). L-Aspartic acid is a nonessential amino acid that is used to biosynthesize other amino acids within the human body.