F-11461
F-11,461 is a naphthylpiperazine drug that acts as an agonist of the 5-HT1A receptor that has been used as a radioligand in PET studies. It possesses modest affinity for the 5-HT7 and D4 receptors, although the interaction of F-11,461 with these receptors is not detectable with PET due to their relative scarcity in the brain.