PG106 TFA is a potent and selective human melanocortin 3 (hMC3) receptor antagonist (IC50= 210 nM) and has noactivity at hMC4 receptors (EC50=9900 nM) and hMC5 receptor[1].
[1]. Paolo Grieco, et al. Further structure-activity studies of lactam derivatives of MT-II and SHU-9119: their activity and selectivity at human melanocortin receptors 3, 4, and 5. Peptides