AR
  -OEChem-04122417553D

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

> <OPENEYE_INCHI>
InChI=1S/Ar

> <OPENEYE_INCHIKEY>
XKRFYHLGVUSROY-UHFFFAOYSA-N

> <FORMULA>
Ar

$$$$