6
ethylene
H  0.924000  1.239000  0.000000
C  0.000000  0.665000  0.000000
H -0.924000  1.239000  0.000000
H  0.924000 -1.239000  0.000000
C  0.000000 -0.665000  0.000000
H -0.924000 -1.239000  0.000000
