UCL 2077 is a selective slow-afterhyperpolarization (sAHP) channel blocker (IC50 = 500 nM in hippocampal neurons in culture), having minimal effects on Ca2+ channels, action potentials, input resistance and the medium after hyperpolarization[1]. UCL 2077 is also a subtype-selective blocker of the epilepsy associated KCNQ channels[2].
References:
[1]. Shah MM, et al. Enhancement of hippocampal pyramidal cell excitability by the novel selective slow-afterhyperpolarization channel blocker 3-(triphenylmethylaminomethyl)pyridine (UCL2077). Mol Pharmacol. 2006 Nov;70(5):1494-502.
[2]. Soh H, et al. The specific slow afterhyperpolarization inhibitor UCL2077 is a subtype-selective blocker of the epilepsy associated KCNQ channels. Mol Pharmacol. 2010 Dec;78(6):1088-95.