#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"
  part:  chemical_notation
  subtype:  molecular_formula__molecularformula  a chemical formula based on analysis and molecular weight
     subtype:  structural_formula  an expanded molecular formula showing the arrangement of atoms within the molecule
  subtype:  empirical_formula__empiricalformula  a chemical formula showing the ratio of elements in a compound rather than the total number of atoms

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