n :  a crystalline anticoagulant coumarin derivative C₁₉H₁₆O₄ related to dicumarol that inhibits the production of prothrombin by vitamin K and is used as a rodent poison and in medicine : also  :  its sodium salt C₁₉H₁₅NaO₄ used esp. in the prevention or treatment of thromboembolic disease - see COUMADIN  .
 
 
 
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