SO4
  -OEChem-04192423173D

  5  4  0     0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000   -1.2010   -0.8500 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000    1.2010   -0.8500 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.2010    0.0000    0.8500 O   0  5  0  0  0  0  0  0  0  0  0  0
    1.2010    0.0000    0.8500 O   0  5  0  0  0  0  0  0  0  0  0  0
  1  2  2  0  0  0  0
  1  3  2  0  0  0  0
  1  4  1  0  0  0  0
  1  5  1  0  0  0  0
M  CHG  2   4  -1   5  -1
M  END
> <OPENEYE_ISO_SMILES>
[O-]S(=O)(=O)[O-]

> <OPENEYE_INCHI>
InChI=1S/H2O4S/c1-5(2,3)4/h(H2,1,2,3,4)/p-2

> <OPENEYE_INCHIKEY>
QAOWNCQODCNURD-UHFFFAOYSA-L

> <FORMULA>
O4S-2

$$$$