C2HNO2

The molecular formula C2HNO2 (molar mass: 71.03 g/mol, exact mass: 71.0007 u) may refer to:


 * Carbonocyanidic acid
 * Formyl cyanate
 * (Hydroxyimino)ethenone HONCCO
 * 2-Nitrosoethenone ONC(H)CO
 * Oximide