CUK
  -OEChem-06282419433D

  6  6  0     0  0  0  0  0  0999 V2000
  -45.8270   36.1360    1.6920 S   0  0  0  0  0  0  0  0  0  0  0  0
  -46.0310   38.4550    2.0320 Cu  0  0  0  0  0  0  0  0  0  0  0  0
  -47.9050   38.2830    3.6360 S   0  0  0  0  0  0  0  0  0  0  0  0
  -44.4990   36.9770    0.1700 Cu  0  0  0  0  0  0  0  0  0  0  0  0
  -43.9320   36.4730    2.7960 Cu  0  0  0  0  0  0  0  0  0  0  0  0
  -47.2430   35.7450    3.6720 Cu  0  0  0  0  0  0  0  0  0  0  0  0
  1  4  1  0  0  0  0
  1  2  1  0  0  0  0
  1  5  1  0  0  0  0
  1  6  1  0  0  0  0
  2  3  1  0  0  0  0
  3  6  1  0  0  0  0
M  END
> <OPENEYE_ISO_SMILES>
S1[Cu]S([Cu]1)([Cu])[Cu]

> <OPENEYE_INCHI>
InChI=1S/4Cu.2S

> <OPENEYE_INCHIKEY>
PDBAWKBNXYUXTL-UHFFFAOYSA-N

> <FORMULA>
Cu4S2

$$$$