    18
 geometry
 C                     0.72668315     0.00000000     0.00000000
 C                    -0.72668315     0.00000000     0.00000000
 C                     1.40374498     1.25245637     0.00000000
 C                    -1.40374498    -1.25245637     0.00000000
 C                    -1.40374498     1.25245637     0.00000000
 C                     1.40374498    -1.25245637     0.00000000
 C                     0.69757586     2.47465325     0.00000000
 C                    -0.69757586    -2.47465325     0.00000000
 C                    -0.69757586     2.47465325     0.00000000
 C                     0.69757586    -2.47465325     0.00000000
 H                     2.49436546     1.25431641     0.00000000
 H                    -2.49436546    -1.25431641     0.00000000
 H                    -2.49436546     1.25431641     0.00000000
 H                     2.49436546    -1.25431641     0.00000000
 H                     1.24657823     3.41672343     0.00000000
 H                    -1.24657823    -3.41672343     0.00000000
 H                    -1.24657823     3.41672343     0.00000000
 H                     1.24657823    -3.41672343     0.00000000
