HMDB0002168
     RDKit          3D
Superoxide
  2  1  0  0  0  0  0  0  0  0999 V2000
    0.6608    0.0000    0.0000 O   0  0  0  0  0  1  0  0  0  0  0  0
   -0.6608    0.0000    0.0000 O   0  0  0  0  0  1  0  0  0  0  0  0
  1  2  1  0
M  CHG  1   2  -1
M  RAD  1   1   2
M  END