Potent and selective dopamine D1-like receptor agonist (pEC50 values are 8.97 and < 5 for D1-like and D2-like receptors respectively). Displays anti-Parkinsonian activity following oral administration in vivo. Exhibits 11-fold cell type bias over dopamine in a functional assay in U2 cells. Purity 98%. MW (observed): 365.9