CQ4
  -OEChem-10112419253D

  5  4  0     0  0  0  0  0  0999 V2000
    0.0000    1.3570   -0.9590 O   0  5  0  0  0  0  0  0  0  0  0  0
    0.0000   -1.3570   -0.9590 O   0  5  0  0  0  0  0  0  0  0  0  0
   -0.0000   -0.0000    0.0000 Cr  0  0  0  0  0  0  0  0  0  0  0  0
    1.3570   -0.0000    0.9590 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.3570    0.0000    0.9590 O   0  0  0  0  0  0  0  0  0  0  0  0
  3  4  2  0  0  0  0
  3  5  2  0  0  0  0
  2  3  1  0  0  0  0
  1  3  1  0  0  0  0
M  CHG  2   1  -1   2  -1
M  END
> <OPENEYE_ISO_SMILES>
[O-][Cr](=O)(=O)[O-]

> <OPENEYE_INCHI>
InChI=1S/Cr.4O/q;;;2*-1

> <OPENEYE_INCHIKEY>
ZCDOYSPFYFSLEW-UHFFFAOYSA-N

> <FORMULA>
CrO4-2

$$$$