    18
 geometry
 C                     0.73942875     0.00000000     0.00000000
 C                    -0.73942875     0.00000000     0.00000000
 C                     1.43173840     1.23433431     0.00000000
 C                    -1.43173840    -1.23433431     0.00000000
 C                    -1.43173840     1.23433431     0.00000000
 C                     1.43173840    -1.23433431     0.00000000
 C                     0.71785402     2.44399194     0.00000000
 C                    -0.71785402    -2.44399194     0.00000000
 C                    -0.71785402     2.44399194     0.00000000
 C                     0.71785402    -2.44399194     0.00000000
 H                     2.51945364     1.24786292     0.00000000
 H                    -2.51945364    -1.24786292     0.00000000
 H                    -2.51945364     1.24786292     0.00000000
 H                     2.51945364    -1.24786292     0.00000000
 H                     1.25194082     3.39183854     0.00000000
 H                    -1.25194082    -3.39183854     0.00000000
 H                    -1.25194082     3.39183854     0.00000000
 H                     1.25194082    -3.39183854     0.00000000
