(-)-Talinolol is the pharmacologically active S-enantiomer of talinolol, a selective beta-1 adrenergic receptor antagonist. It is primarily used in pharmacological research to study beta-blocker effects on the cardiovascular system, including investigations into hypertension, arrhythmia, and cardioprotection. As a specialty chemical, it offers higher potency and specificity compared to the racemic mixture, making it valuable for in vitro and in vivo studies. It is not a commodity chemical but a niche pharmaceutical intermediate.