(3,4-dihydroxyphenylamino)-2-imidazoline [ (3,4-dihydroxyphenylamino)-2-imidazoline, hydrochloride,(3,4-dihydroxyphenylamino)-2-imidazoline, mono-hydrobromide,(3,4-dihydroxyphenylamino)-2-imidazoline, mono-hydrochloride,2-(3,4-dihydroxyphenylimino)imidazolidine,DPI ((3,4-dihydroxyphenylamino)-2-imidazoline) ] potent agonist at dopamine receptors mediating neuronal inhibition; RN given refers to parent cpd; structure in UD indicates phenyl-"imino" group