    18
 geometry
 C                     0.00000000     0.00000000    -2.50732986
 C                     0.00000000     1.26760822    -1.91345300
 C                     0.00000000    -1.26760822    -1.91345300
 C                     0.00000000    -1.59598879    -0.55259764
 C                     0.00000000     1.59598879    -0.55259764
 C                     0.00000000    -0.75006502     0.55479295
 C                     0.00000000     0.75006502     0.55479295
 C                     0.00000000     1.15094676     1.90443639
 C                     0.00000000    -1.15094676     1.90443639
 C                     0.00000000     0.00000000     2.71222791
 H                     0.00000000     0.00000000    -3.59658770
 H                     0.00000000    -2.11059907    -2.60141777
 H                     0.00000000     2.11059907    -2.60141777
 H                     0.00000000    -2.66218813    -0.32453767
 H                     0.00000000     2.66218813    -0.32453767
 H                     0.00000000     2.17807420     2.25152840
 H                     0.00000000    -2.17807420     2.25152840
 H                     0.00000000     0.00000000     3.79754941
