Potent and selective somatostatin sst4 receptor agonist. Ki values are 0.7, 199, 4720, 1280 and 3880 nM for cloned human sst4, sst1, sst2, sst3 and sst5 receptors respectively. Facilitates AMPA-mediated hippocampal synaptic responses in vitro and increases kainate-induced seizures in mice in vivo. Purity 97%. MW (observed): 599.56