Data items in the CHEMICAL category would not in general be
               used in a macromolecular CIF. See instead the ENTITY data
               items.
               Data items in the CHEMICAL category record details about the
               composition and chemical properties of the compounds. The
               formula data items must agree with those that specify the
               density, unit-cell and Z values.
 
    _chemical.entry_id        '9597gaus'
    _chemical.name_systematic
      trans-bis(tricyclohexylphosphine)tetracarbonylmolybdenum(0)
      