ChemicalBook -- 25052-62-4
  -INDIGO-01162512002D

  4  2  0  0  0  0  0  0  0  0999 V2000
    0.0000    1.5400    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.5400    1.5400    0.0000 O   0  0  0  0  0  3  0  0  0  0  0  0
    0.0000    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.5400    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  3  0  0  0  0
  3  4  2  0  0  0  0
M  CHG  2   1  -1   2   1
M  END