OAA
  -OEChem-04192423163D

 12 11  0     0  0  0  0  0  0999 V2000
   -2.0550   -1.0700    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -3.0200    0.8090    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0
    2.1500    1.4090    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8480   -0.6950    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.1630   -1.3730    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.9950    0.1480    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.6540    0.8360    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.4420   -0.1980    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8700    0.2290    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.7750   -0.4180    0.0000 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5660    1.4600    0.8900 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5660    1.4600   -0.8900 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-

$$$$