Maleic anhydride Other names: Dihydro-2,5-dioxofuran Maleic acid anhydride Toxilic anhydride Formula: C4H2O3 CAS: 108-31-6 Weight: 98,06 g/mol Boiling point: 202 °C Melting point: 52,6 °C (sublimation) Density: 1,48 g/cm3