    18
 geometry
 C                     0.71732360     0.00000000     0.00000000
 C                    -0.71732360     0.00000000     0.00000000
 C                     1.40388868     1.24593170     0.00000000
 C                    -1.40388868    -1.24593170     0.00000000
 C                    -1.40388868     1.24593170     0.00000000
 C                     1.40388868    -1.24593170     0.00000000
 C                     0.70922404     2.43664372     0.00000000
 C                    -0.70922404    -2.43664372     0.00000000
 C                    -0.70922404     2.43664372     0.00000000
 C                     0.70922404    -2.43664372     0.00000000
 H                     2.49189747     1.24422215     0.00000000
 H                    -2.49189747    -1.24422215     0.00000000
 H                    -2.49189747     1.24422215     0.00000000
 H                     2.49189747    -1.24422215     0.00000000
 H                     1.24692310     3.38134386     0.00000000
 H                    -1.24692310    -3.38134386     0.00000000
 H                    -1.24692310     3.38134386     0.00000000
 H                     1.24692310    -3.38134386     0.00000000
