Acetyl Tetrapeptide-2 is the reaction product of Acetic Acid (q.v.) and a synthetic peptide containing Aspartic Acid (q.v.), Lysine (q.v.), Tyrosine (q.v.) and Valine (q.v.) residues. Acetyl Tetrapeptide-2 is the reaction product of acetic acid and Tetrapeptide-2 (q.v.).