GD3
  -OEChem-11012421173D

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

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

> <OPENEYE_INCHIKEY>
RJOJUSXNYCILHH-UHFFFAOYSA-N

> <FORMULA>
Gd+3

$$$$