on the other hand , there was no significant correlation between the ki and the pd2 value of the alpha-agonists ( norepinephrine , epinephrine , phenylephrine and naphazoline ) , indicating that there is a non-linear relationship between agonist binding to myocardial alpha 1-adrenoceptors and subsequent functional changes .
C0028351
norepinephrine
C0014563
epinephrine