#chemical_formula__formula  a representation of a substance using symbols for its constituent elements
  supertype:  statement  a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc; "according to his statement he was in London on that day"
  subtype:  molecular_formula  empirical_formula
  part:  chemical_notation  a notation used by chemists to express technical facts in chemistry

No statement uses or specializes chemical_formula; click here to add one.