8
 
 C     0.000000     0.000000     0.000000
 C     0.000000     0.000000     1.439000
 C     1.439000     0.000000     1.439000
 C     1.439000     0.000000     0.000000
 H    -0.758726     0.000000    -0.758726
 H     2.197726     0.000000     2.197726
 H     2.197726     0.000000    -0.758726
 H    -0.758726     0.000000     2.197726