Dihexa is composed of three amino acids, and there is a n-hexanoic acid in the N segment, so the structure of the peptide is relatively stable. Because Dihexa has a relatively low molecular weight, Dihexa is a raw material for oral administration in clinical practice. Its main role is to angiotensin IV analogs that penetrate the blood-brain barrier and have high affinity for hepatocyte growth factor (HGF).