graphkit-learn/datasets/Acyclic/butyl_methyl_ether.ct

 6 5
    0.0000    0.0000    0.0000 C
    0.0000    0.0000    0.0000 C
    0.0000    0.0000    0.0000 C
    0.0000    0.0000    0.0000 C
    0.0000    0.0000    0.0000 C
    0.0000    0.0000    0.0000 O
  1  3  1  1
  2  6  1  1
  3  4  1  1
  4  5  1  1
  5  6  1  1