has part has part has role warfarin A racemate comprising equal amounts of (R)- and (S)-warfarin. Extensively used as both an anticoagulant drug and as a pesticide against rats and mice. rodenticide anticoagulant EC 1.6.5.2 [NAD(P)H dehydrogenase (quinone)] inhibitor warfarin(1-) vitamin K antagonist racemate (R)-warfarin (S)-warfarin