TCN
  -OEChem-07192416113D

  9  8  0     0  0  0  0  0  0999 V2000
   27.7960   35.6340   18.2910 Ni  0  6  0  0  0  0  0  0  0  0  0  0
   28.8030   34.9740   16.8600 C   0  0  0  0  0  0  0  0  0  0  0  0
   29.4070   34.5470   15.9790 N   0  0  0  0  0  0  0  0  0  0  0  0
   26.7110   36.5750   17.0940 C   0  0  0  0  0  0  0  0  0  0  0  0
   26.0570   37.1710   16.3600 N   0  0  0  0  0  0  0  0  0  0  0  0
   26.7400   36.2290   19.7150 C   0  0  0  0  0  0  0  0  0  0  0  0
   26.1010   36.6140   20.5910 N   0  0  0  0  0  0  0  0  0  0  0  0
   28.8460   34.6470   19.4840 C   0  0  0  0  0  0  0  0  0  0  0  0
   29.4810   34.0240   20.2150 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

$$$$