CUA
  -OEChem-11012421173D

  2  1  0     0  0  0  0  0  0999 V2000
    0.0000    0.0000   -0.8700 Cu  0  0  0  0  0  0  0  0  0  0  0  0
    0.0000    0.0000    0.8700 Cu  0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
M  END
> <OPENEYE_ISO_SMILES>
[Cu][Cu]

> <OPENEYE_INCHI>
InChI=1S/2Cu

> <OPENEYE_INCHIKEY>
ALKZAGKDWUSJED-UHFFFAOYSA-N

> <FORMULA>
Cu2

$$$$