Treatment of humans suffering from conditions caused by higher-than-normal dopaminergic activity in basal ganglia includes administering the compound (2S)-2-{3-[3-({[(2R,4R)-4-tert-Butoxycarbonyl-2-(2-fluorophenyl)]-3-thiazolidinyl}carbonylmethyl)ureido]phenyl}propionic acid and its physiological acceptable salts.
