Semax acetate is a BBB-penetrable adrenocorticotropic hormone-like peptide and can form stable complexes with Cu²⁺. Semax acetate is a synthetic peptide analog of Adrenocorticotropic hormone (ACTH) (4-10). Semax acetate has immunomodulatory, nootropic and neuroprotective activities. Semax acetate can be used in the research of central nervous system diseases such as Alzheimer's disease and cerebral ischemia.