2FK
  -OEChem-05172421143D

  2  1  0     0  0  0  0  0  0999 V2000
   27.2900   26.8880   33.8750 O   0  5  0  0  0  0  0  0  0  0  0  0
   26.6300   27.4190   32.6400 O   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  2  0  0  0  0
M  CHG  1   1  -1
M  END
> <OPENEYE_ISO_SMILES>
[O-]=O

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

> <OPENEYE_INCHIKEY>
MXDZWXWHPVATGF-UHFFFAOYSA-N

> <FORMULA>
O2-

$$$$