PT-141 (Bremelanotide) is a synthetic cyclic heptapeptide derived from Melanotan II. It acts as a non-selective agonist of melanocortin receptors and has been studied for its effects on the central melanocortin system, which regulates pigmentation, energy homeostasis, and autonomic function.

Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic heptapeptide derived from the ACTH(4-7) sequence with a Pro-Gly-Pro C-terminal extension designed to increase stability. It has been studied extensively in Russian research programs for neuroprotective effects in models of stroke, cognitive impairment, and neurotrophic factor regulation.

Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a synthetic heptapeptide derived from the immunomodulatory tetrapeptide tuftsin (Thr-Lys-Pro-Arg) with a Pro-Gly-Pro C-terminal extension. It has been studied in Russian research programs in preclinical models.