1) Coumarin drug 
Difenacoum is an anticoagulant of the 4-hydroxycoumarin vitamin K antagonist type. It has anticoagulant effects and is used commercially as a rodenticide. ==Uses== Difenacoum is sold as blue-green pellets intended to be ingested by pests such as rats and mice. ==Safety and toxicity== Because other species of mammals and birds may prey upon affecte...