4-Hydroxycoumarins

**Definition:** Substances found in many plants, containing the 4-hydroxycoumarin radical. They interfere with vitamin K and the blood clotting mechanism, are tightly protein-bound, inhibit mitochondrial and microsomal enzymes, and are used as oral anticoagulants.

**Tree numbers:** - D03.383.663.283.446.520 - D03.633.100.150.446.520