3-Amino-2-hydroxy-biphenyl-3-carboxylic acid is an organic compound featuring both amino and carboxylic acid functional groups on a biphenyl scaffold. It serves as a versatile building block in medicinal chemistry, particularly for the synthesis of heterocyclic compounds. Its structure makes it a valuable intermediate for constructing more complex molecular architectures. This compound is primarily utilized in pharmaceutical research and development as a key intermediate. It has been specifically referenced in the synthesis of novel heterocyclic compounds with potential biological activity. The presence of multiple reactive sites (amine, carboxylic acid, and hydroxyl groups) allows for diverse chemical modifications, enabling its incorporation into drug candidates targeting various therapeutic areas. As a bifunctional synthon containing both an aromatic amine and a carboxylic acid, it is also employed in organic synthesis for constructing amide bonds and for further functionalization. Its utility extends to the preparation of libraries of compounds for biological screening in drug discovery programs.