A GnRHR agonist; binds to recombinant human type I and marmoset type II GnRHRs expressed in COS-7 cells (IC50s = 26.1 and 1.07 nM, respectively) and stimulates inositol phosphate production (EC50s = 7.41 and 0.45 nM, respectively); stimulates LH and FSH release from cultured primary rhesus monkey anterior pituitary cells (EC50s = 0.37 and 0.59 nM, respectively); increases plasma LH levels in White Leghorn pullets (1 μg/kg, i.v.); decreases food intake in zebrafish (1 pmol/g, i.c.v.); increases courtship behavior in female white-crowned sparrows (100 ng, i.c.v.),