ChEBI: (R)-noradrenaline is the R-enantiomer of noradrenaline. It has a role as a vasoconstrictor agent, an alpha-adrenergic agonist, a sympathomimetic agent, a mouse metabolite and a neurotransmitter. It is a conjugate base of a (R)-noradrenaline(1+). It is an enantiomer of a (S)-noradrenaline.NCI Thesaurus (NCIt): l-Norepinephrine is a naturally occurring catecholamine hormone that functions as a neurotransmitter in the sympathetic nervous system. Norepinephrine directly stimulates adrenergic receptors. Stimulation of alpha-adrenergic receptors causes vasoconstriction of the radial smooth muscle of the iris, arteries, arterioles, veins, urinary bladder, and the sphincter of the gastrointestinal tract. Stimulation of beta-1 adrenergic receptors causes an increase in myocardial contractility, heart rate, automaticity, and atrioventricular (AV) conduction while stimulation of beta-2 adrenergic receptors causes bronchiolar and vascular smooth muscle dilatation. The R-enantiomer of noradrenaline.