OFE
  -OEChem-08092421283D

  2  1  0     0  0  0  0  0  0999 V2000
    4.4120   -0.2920   53.7160 Fe  0  0  0  0  0  0  0  0  0  0  0  0
    4.3950   -0.2530   51.4820 O   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  2  0  0  0  0
M  END
> <OPENEYE_ISO_SMILES>
O=[Fe]

> <OPENEYE_INCHI>
InChI=1S/Fe.O

> <OPENEYE_INCHIKEY>
UQSXHKLRYXJYBZ-UHFFFAOYSA-N

> <FORMULA>
FeO

$$$$