ST171 is a bitopic 5-HT1AR agonist with an Ki of 0.41 nM. ST171 selectively activates Gi/o signaling pathway and inhibits 5-HT1AR-mediated cAMP accumulation without Gs activation and marginal β-arrestin recruitment. T171 reduces hypersensitivity in chronic neuropathic and inflammatory pain mice model. ST171 can be used for pain research[1].