(R)-Acenocoumarol ((R)-Acenocoumarin; (R)-Nicoumalone) is a short-acting, orally administered anticoagulant that works by inhibiting vitamin K epoxide reductase (vitamin K1 recycling), similar to Warfarin. It demonstrates greater anticoagulant potency in vivo compared to Warfarin. This compound has a single chiral center, resulting in two enantiomeric forms. The (R)-enantiomer has a longer plasma elimination half-life of 6.6 hours, slower plasma clearance of 1.9 L/h, and stronger anticoagulation effects than the (S)-enantiomer.