Furan-2,5-dione, also known as maleic anhydride, is a cyclic compound with the formula C4H2O3. It features a five-membered ring containing two carbonyl groups (C=O) at the 2 and 5 positions. This compound is a colorless solid at room temperature and is known for its reactivity, particularly in addition reactions with nucleophiles. Furan-2,5-dione is commonly used in the production of various chemicals, including polyester resins and adhesives. It also serves as an important intermediate in organic synthesis, contributing to the formation of other complex molecules. Its unique structure allows it to participate in diverse chemical reactions.