graphkit-learn/datasets/PAH/triphenylene.ct

C18H12
 18 21
    5.6039    1.3190    0.0000 C
    5.0901    2.2250    0.0000 C
    4.0484    2.2250    0.0000 C
    3.5346    1.3190    0.0000 C
    4.0693    0.4250    0.0000 C
    3.5693   -0.4410    0.0000 C
    2.5278   -0.4249    0.0000 C
    2.0000   -1.3230    0.0000 C
    2.5208   -2.2250    0.0000 C
    3.5624   -2.2170    0.0000 C
    4.0693   -1.3070    0.0000 C
    5.0693   -1.3070    0.0000 C
    5.5761   -2.2170    0.0000 C
    6.6177   -2.2250    0.0000 C
    7.1385   -1.3230    0.0000 C
    6.6108   -0.4249    0.0000 C
    5.5693   -0.4410    0.0000 C
    5.0693    0.4250    0.0000 C
   1    2    5    5
   2    3    5    5
   3    4    5    5
   4    5    5    5
   5    6    5    5
   6    7    5    5
   7    8    5    5
   8    9    5    5
   9   10    5    5
  10   11    5    5
   6   11    5    5
  11   12    5    5
  12   13    5    5
  13   14    5    5
  14   15    5    5
  15   16    5    5
  16   17    5    5
  12   17    5    5
  17   18    5    5
   1   18    5    5
   5   18    5    5