    18
 geometry
 C                     0.00000000     0.00000000    -2.53603051
 C                     0.00000000     1.27733432    -1.91540049
 C                     0.00000000    -1.27733432    -1.91540049
 C                     0.00000000    -1.60809928    -0.56949599
 C                     0.00000000     1.60809928    -0.56949599
 C                     0.00000000    -0.72714588     0.56652776
 C                     0.00000000     0.72714588     0.56652776
 C                     0.00000000     1.14275937     1.91784755
 C                     0.00000000    -1.14275937     1.91784755
 C                     0.00000000     0.00000000     2.75108856
 H                     0.00000000     0.00000000    -3.62689553
 H                     0.00000000    -2.12411289    -2.60676532
 H                     0.00000000     2.12411289    -2.60676532
 H                     0.00000000    -2.67436562    -0.33253752
 H                     0.00000000     2.67436562    -0.33253752
 H                     0.00000000     2.17900724     2.24975774
 H                     0.00000000    -2.17900724     2.24975774
 H                     0.00000000     0.00000000     3.83837646
