2 ) in radioligand binding studies , alpha-methylepinephrine was as potent as norepinephrine in competing for alpha 2-receptors , more potent than epinephrine , norepinephrine , or alpha-methylnorepinephrine in competing for beta-receptors , and less potent than epinephrine , norepinephrine , or alpha-methylnorepinephrine in competing for alpha 1-receptors .
C0028351
norepinephrine
C0025805
alpha-methylnorepinephrine