A nonpeptidic quinoxaline compound that acts as a GLP-1R agonist and an allosteric modulator of GLP-1 binding. Shown to induce GLP-1R-mediated cAMP production in BHK plasma membrane preparations (EC50=101nM) and potentiate glucose-dependent insulin release in pancreatic islets derived from wild-type, but not GLP-1R -/-, mice. Unlike GLP-1, its biological activity is not inhibited by orthosteric antagonists such as Exendin.