Y-26763 is a K+ channel opener and active metabolite of Y-27152[1]. Y-26763 is an ATP-sensitive K+ (KATP) channel activator[2].
References:
[1]. Itoh T, et al. Effects of a newly synthesized K+ channel opener, Y-26763, on noradrenaline-induced Ca2+ mobilization in smooth muscle of the rabbit mesenteric artery. Br J Pharmacol. 1994 Jan;111(1):165-72.
[2]. Tran QTN, et al. The identification of naturally occurring labdane diterpenoid calcaratarin D as a potential anti-inflammatory agent. Eur J Med Chem. 2019 Jul 15;174:33-44.