title: C2HNO2
text: # C2HNO2
  
  The molecular formula $C_2HNO_2$ (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
  