BIBP3226 TFA is an effective and selective antagonist of neuropeptide Y Y1 (NPY Y1) and neuropeptide FF (NPFF) receptor (Kis: 1.1, 79, and 108 nM for rNPY Y1, hNPFF2, and rNPFF).
UBP 302 is an effective and selective GLUK5-subunit-containing kainate receptor antagonist (apparent Kd=402 nM) and displays very little affinity on GluK2 kainate receptors.
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, rNPY Y2, rNPY Y4and rNPY Y5respectively). Produces an anxiogenic-like effect in rats following i.c.v. administration.