An enantiomer of the short-lived oral anti-coagulant acenocoumarol with a longer plasma elimination half-life (6.6 hours) and slower plasma clearance (1.9 L/hour), compared to the (S)-enantiomer (1.8 hours, 28.5 L/hour); rapidly absorbed from the gastrointestinal tract with essentially complete oral bioavailability; more potent in vivo than the (S)-enantiomer