Acetic acid anhydride Other names: Acetyl anhydride Acetic oxide Acetyl oxide Ethanoic anhydride Acetanhydride Formula: C4H6O3 CAS: 108-24-7 Weight: 102,09 g/mol Boiling point: 139,6 °C Melting point: -73,1 °C Density: 1,082 g/cm3