PER
  -OEChem-04192423173D

  2  1  0     0  0  0  0  0  0999 V2000
   -0.7340    0.0000    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0
    0.7340    0.0000    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
M  CHG  2   1  -1   2  -1
M  END
> <OPENEYE_ISO_SMILES>
[O-][O-]

> <OPENEYE_INCHI>
InChI=1S/O2/c1-2/q-2

> <OPENEYE_INCHIKEY>
ANAIPYUSIMHBEL-UHFFFAOYSA-N

> <FORMULA>
O2-2

$$$$