On the connection between the symmetry of internal dynamics of a nonrigid molecule and the geometry of its equilibrium configurations

For the example of nonrigid nitromethane and toluene molecules CH₃NO₂ and CH₃C₆H₅ in the ground electronic states, the possibility of using the observed symmetry properties of internal dynamics of a nonrigid molecule for the correct choice of its equilibrium configurations is considered in the case where different possible geometries of such configurations correspond to the same point group.