the retention of norepinephrine , alpha-methylnorepinephrine , dopamine , alpha-methyldopamine , l-dopa , alpha-methyldopa , dihydroxybenzylamine , epinephrine , carbidopa and dopac was measured in mobile phases composed of nitric , sulfuric , acetic and trichloroacetic acids at ph 2-5 and anion concentrations ranging from 5-500 mm .
C0028351
norepinephrine
C0025805
alpha-methylnorepinephrine