metal_sdf/FE_ideal.sdf

FE
  -OEChem-03222417093D

  1  0  0     0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 Fe  0  1  0  0  0  0  0  0  0  0  0  0
M  CHG  1   1   3
M  END
> <OPENEYE_ISO_SMILES>
[Fe+3]

> <OPENEYE_INCHI>
InChI=1S/Fe/q+3

> <OPENEYE_INCHIKEY>
VTLYFUHAOXGGBS-UHFFFAOYSA-N

> <FORMULA>
Fe+3

$$$$