12
This conformation of trans-2-butene has Cs symmetry
 6   0.079671214   0.000000000  -1.946157723
 6  -0.398435629   0.000000000  -0.530829424
 6   0.414670562   0.000000000   0.536329294
 1  -1.476799257   0.000000000  -0.385843206
 1   1.493548373   0.000000000   0.398689645
 6  -0.085652582   0.000000000   1.943569693
 1   1.172122035   0.000000000  -2.014181840
 1  -0.294800719   0.887209845  -2.465777944
 1  -0.294800719  -0.887209845  -2.465777944
 1   0.759645174   0.000000000   2.639233900
 1  -0.684584225  -0.893332063   2.145372774
 1  -0.684584225   0.893332063   2.145372774
