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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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Arkansas Valley Regional Medical Center (La Junta, Colorado - Otero County)