“…,beta-adrenergic agonists led to a 4 to 6 fold stimulation of cyclic AMP concentration with the following order of potency (Kd values): zinterol (0.…) greater than (--)-isoproterenol (4.6 nM) greater than soterenol greater than (7.7 nM) greater than (--)-epinephrine (10 nM) greater than OPC 2009 (… nM).”