TCN
  -OEChem-07192415493D

  9  8  0     0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 Ni  0  6  0  0  0  0  0  0  0  0  0  0
    0.0000   -1.7830   -1.2610 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000   -2.7110   -1.9170 N   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000    1.7830   -1.2610 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000    2.7110   -1.9170 N   0  0  0  0  0  0  0  0  0  0  0  0
   -1.7830    0.0000    1.2610 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.7110    0.0000    1.9170 N   0  0  0  0  0  0  0  0  0  0  0  0
    1.7830    0.0000    1.2610 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7110    0.0000    1.9170 N   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  1  4  1  0  0  0  0
  1  6  1  0  0  0  0
  1  8  1  0  0  0  0
  2  3  3  0  0  0  0
  4  5  3  0  0  0  0
  6  7  3  0  0  0  0
  8  9  3  0  0  0  0
M  CHG  1   1  -2
M  END
> <OPENEYE_ISO_SMILES>
C(#N)[Ni-2](C#N)(C#N)C#N

> <OPENEYE_INCHI>
InChI=1S/4CN.Ni/c4*1-2;/q;;;;-2

> <OPENEYE_INCHIKEY>
FUWOSUXMFKRUSS-UHFFFAOYSA-N

> <FORMULA>
C4N4Ni-2

$$$$