data_1
_chemical_formula_sum    ?
_chemical_formula_sum    'Ca H2'
_chemical_formula_moiety 'Ca 2+, H2 2-'
_chemical_formula_sum
;
  ?
;
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
? ? ? ?
