    18
 geometry
 C                     0.00000000     0.00000000    -2.52211414
 C                     0.00000000     1.26442606    -1.92123101
 C                     0.00000000    -1.26442606    -1.92123101
 C                     0.00000000    -1.59381482    -0.55383476
 C                     0.00000000     1.59381482    -0.55383476
 C                     0.00000000    -0.72509684     0.52875731
 C                     0.00000000     0.72509684     0.52875731
 C                     0.00000000     1.13589566     1.92304558
 C                     0.00000000    -1.13589566     1.92304558
 C                     0.00000000     0.00000000     2.73854958
 H                     0.00000000     0.00000000    -3.60954131
 H                     0.00000000    -2.11005390    -2.60476841
 H                     0.00000000     2.11005390    -2.60476841
 H                     0.00000000    -2.65691705    -0.32106236
 H                     0.00000000     2.65691705    -0.32106236
 H                     0.00000000     2.16724731     2.25806942
 H                     0.00000000    -2.16724731     2.25806942
 H                     0.00000000     0.00000000     3.82156074
