GD
  -OEChem-04192423153D

  1  0  0     0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 Gd  0  0  0  0  0  0  0  0  0  0  0  0
M  END
> <OPENEYE_ISO_SMILES>
[Gd]

> <OPENEYE_INCHI>
InChI=1S/Gd

> <OPENEYE_INCHIKEY>
UIWYJDYFSGRHKR-UHFFFAOYSA-N

> <FORMULA>
Gd

$$$$