Benzopyrone may refer to either of two ketone derivatives of benzopyran which constitute the core skeleton of many flavonoid compounds:

• Chromone
  Chromone
  Chromone is a derivative of benzopyran with a substituted keto group on the pyran ring. It is an isomer of coumarin.Derivatives of chromone are collectively known as chromones...
  
   (1-benzopyran-4-one)
• Coumarin
  Coumarin
  Coumarin is a fragrant chemical compound in the benzopyrone chemical class, found in many plants, notably in high concentration in the tonka bean , vanilla grass , sweet woodruff , mullein , sweet grass , cassia cinnamon and sweet clover...
  
   (1-benzopyran-2-one)

Certain simple benzopyrones have clinical medical value as an edema modifiers. Coumarin

Coumarin

Coumarin is a fragrant chemical compound in the benzopyrone chemical class, found in many plants, notably in high concentration in the tonka bean , vanilla grass , sweet woodruff , mullein , sweet grass , cassia cinnamon and sweet clover...

 and other benzopyrones, such as 5,6 benzopyrone, 1,2 benzopyrone, diosmin

Diosmin

Diosmin is a semisynthetic phlebotropic drug , a member of the flavonoid family. It is an oral phlebotropic drug used in the treatment of venous disease, i.e., chronic venous insufficiency and hemorrhoidal disease , in acute or chronic hemorrhoids, in place of rubber-band ligation, in combination...

 and others are known to stimulate macrophages to degrade extracellular albumin, allowing faster resorption of edematous fluids.

Naturally occurring coumarin is also the basis for various 4-hydroxybenzopyrone-based molecules which occur naturally dicoumarol and are made synthetically warfarin

Warfarin

Warfarin is an anticoagulant. It is most likely to be the drug popularly referred to as a "blood thinner," yet this is a misnomer, since it does not affect the thickness or viscosity of blood...

and function as anticoagulants.