Potent, selective and competitive nonpeptide antagonist for the neuropeptide Y Y2 receptor (IC50 = 15 nM). Displays > 650-fold selectivity for NPYY2 over Y1, Y4 and Y5 receptors. Active in vivo.
BIBP 3226 trifluoroacetate is a mixed non-peptide neuropeptide Y Y1(NPY Y1) and neuropeptide FF (NPFF) receptor antagonist (Kivalues are 1.1, 79, 108, > 1000, > 1000 and >1000 for rNPY Y1, hNPFF2, rNPFF, rNPYY2, rNPY Y4and rNPY Y5respectively). Produces an anxiogenic-like effect in rats following i.c.v. administration.