“…Negative musculotropic agents, such as sodium nitrite, dipyridamole, papaverine, and sodium cobaltinitrite (1) and certain a-adrenergic blocking agents, such as dibenamine, phenoxybenzamine, phentolamine, tolazoline, and hydralazine (1,4,5 ) have been shown to antagonize effectively the pressor response t o this polypeptide.…”