A potent and selective dopamine D2 receptor agonist (Kis = 0.912 and 6,935 nM for D2 and D1 receptors, respectively, in rat striatum); inhibits PRL secretion in and growth of rat pituitary tumor cells in a concentration-dependent manner; suppresses the mTOR signaling pathway in a time-dependent manner and induces autophagy and cell death in MMQ and GH3 rat pituitary cells; stimulates motor activity and decreases dyskinesias in a monkey model of MPTP-induced Parkinson's disease when administered at a dose of 0.25 mg/kg