OAA
  -OEChem-04192423353D

 12 11  0     0  0  0  0  0  0999 V2000
   13.8310   -9.0140   -1.4580 O   0  0  0  0  0  0  0  0  0  0  0  0
   12.4640   -9.0430    0.3170 O   0  5  0  0  0  0  0  0  0  0  0  0
   15.3120   -5.0870   -2.6340 O   0  0  0  0  0  0  0  0  0  0  0  0
   13.2470   -5.4360   -2.0400 O   0  0  0  0  0  0  0  0  0  0  0  0
   16.1080   -6.8890   -0.7560 O   0  0  0  0  0  0  0  0  0  0  0  0
   13.3000   -8.4920   -0.4550 C   0  0  0  0  0  0  0  0  0  0  0  0
   13.8000   -7.1310   -0.0660 C   0  0  0  0  0  0  0  0  0  0  0  0
   14.9390   -6.5850   -0.8860 C   0  0  0  0  0  0  0  0  0  0  0  0
   14.4440   -5.6460   -1.9400 C   0  0  0  0  0  0  0  0  0  0  0  0
   12.5840   -5.8620   -1.5100 H   0  0  0  0  0  0  0  0  0  0  0  0
   12.9540   -6.4040   -0.0620 H   0  0  0  0  0  0  0  0  0  0  0  0
   14.0740   -7.1240    1.0140 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  6  2  0  0  0  0
  2  6  1  0  0  0  0
  3  9  2  0  0  0  0
  4  9  1  0  0  0  0
  4 10  1  0  0  0  0
  5  8  2  0  0  0  0
  6  7  1  0  0  0  0
  7  8  1  0  0  0  0
  7 11  1  0  0  0  0
  7 12  1  0  0  0  0
  8  9  1  0  0  0  0
M  CHG  1   2  -1
M  END
> <OPENEYE_ISO_SMILES>
C(C(=O)C(=O)O)C(=O)[O-]

> <OPENEYE_INCHI>
InChI=1S/C4H4O5/c5-2(4(8)9)1-3(6)7/h1H2,(H,6,7)(H,8,9)/p-1

> <OPENEYE_INCHIKEY>
KHPXUQMNIQBQEV-UHFFFAOYSA-M

> <FORMULA>
C4H3O5-

$$$$