MLS1547 is a potent and selective G protein-biased agonist of the dopamine D2 receptor, exhibiting a Ki of 1.2 µM. It activates G protein-mediated signaling with an EC50 of 0.37 µM in calcium flux assays, making it a valuable research tool for studying biased signaling in neuropharmacology, including in vitro models of psychiatric and neurological disorders.