Warfarin
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Warfarin (IUPAC name 4-hydroxy-3-(3-oxo-1-phenylbutyl)-2H-chromen-2-one) is a an anticoagulant medication used prophylactically to suppress the formation of thrombosis and embolism. It was originally designed to be a rat poison. It works as an anticogulant by suppressing the enzyme epoxide reductase in the liver, thereby suppresing the formation of the reduced form of vitamine K epoxide, which is needed for the synthesis of many coagulation factors.