<prompt> Dobutamine differs from dopamine in thatIt has good blood-brain barrier penetrabilityIt causes pronounced tachycardiaIt does not activate adrenergic b receptorsIt does not activate peripheral dopaminergic receptors  <response>: Dopamine DA:- It is a dopaminergic D1 and D2 as well as adrenergic a and b1 but not b2 agonist. Dobutamine:- A derivative of DA, but not a D1 or D2 receptor agonist. Though it acts on both a and b adrenergic receptors. Ref:- kd tripathi; pg num:-134 