8

C    0.000000000   0.603564000  -2.181734380
H    0.000000000   1.668475810  -2.184296100
C    0.000000000  -0.603564000  -2.181734380
H    0.000000000  -1.668475810  -2.184296100
C   -0.000000000   0.000000000   1.578295130
H   -0.000000000   0.000000000   0.511361930
C   -0.000000000   0.000000000   2.785765430
H   -0.000000000   0.000000000   3.850178590