The dermorphin analog peptide binds to mu-opioid and delta-opioid receptors with higher affinity and selectivity than morphin. Like other opioid agonists, this peptide affects learning and memory as well as motor activity and exhibits neuromodulatory and antinociceptive/analgesic activities.H-Tyr-D-Arg-Phe-Sar-Tyr-Pro-Ser-NH2 or H-YrF-Sar-YPS-NH2