4-Hydroxycoumarins

4-Hydroxycoumarins are a class of molecules derived from coumarin by adding a hydroxy group at the 4 position.

Examples include:
 * acenocoumarol
 * dicumarol
 * ethyl biscoumacetate
 * phenprocoumon
 * warfarin

Drugs in this class are noted primarily for their use as anticoagulants, though they can have several additional effects.