SU-4029 (dihydrochloride)

Su-4029 is an agent that interacts with alpha receptors. It negates the blockade of norepinephrine by the reversible adrenergic blocker phentolamine but not by the irreversible blocker Dibenamine, suggesting Su-4029 acts at the same site as these blockers. Su-4029 pretreatment results in three categories of responses to pressor phenylalkylamines: irreversible blockade of amines with no or only p-hydroxylation, reversible blockade of amines with beta-carbon hydroxylation, and no blockade or augmentation of amines with m and p-hydroxylation or m or p plus beta-hydroxylation. Su-4029 may deform the alpha receptor site affected by adrenergic blocking agents[1].