(R)-Atenolol is the R-enantiomer of the beta-blocker Atenolol, primarily utilized in pharmaceutical research and development. Unlike the therapeutically active (S)-enantiomer, which is used for treating hypertension, angina, arrhythmias, and reducing heart attack risk through selective beta-1 adrenergic receptor blockade, the (R)-enantiomer exhibits minimal beta-blocking activity. It serves as a key intermediate or reference compound in stereochemical studies, drug synthesis, and analytical method development for cardiovascular pharmaceuticals.