R-(+)-Warfarin Sodium Description Optical Rotation: [a]D23 = +125 (c = 3.2, ethanol) Optically active R enantiomer of Warfarin Sodium. Used for preventing thrombosis and embolism. A synthetic derivative of coumarin. Decreases blood coagulation by inhibiting vitamin K epoxide reductase. Specifications Product ID W0275 Product Name R-(+)-Warfarin Sodium Formula Wt. 330.31 Purity ≥98%