Pharmacological properties of 1-(4'-nitrophenyl)-2-isopropylamino-ethanol (INPEA), a new beta-adrenergic receptor antagonist. IV. Effects of the optical isomers D (minus) and L (plus) INPEA on the arterial pressure and on the pressor responses to noradrenaline, adrenaline and isoproterenol in urethan-anesthetised rats.