The molecular formula C2H2O3 (molar mass: 74.04 g/mol, exact mass: 74.0004 u) may refer to:
- Formic anhydride, or methanoic anhydride
- Glyoxylic acid, or oxoacetic acid
The molecular formula C2H2O3 (molar mass: 74.04 g/mol, exact mass: 74.0004 u) may refer to: