where ✏ ↵ are the Levi-Civita symbols. The COM components, which are a result of the SCME description of the electrostatic interaction, need to be redistributed among the atomic centers of the molecule (note that the methyl group in this model is simply considered as an atom with position at the center of mass of the methyl group, and with the same mass as methyl). This can be achieved by solving for a set of equations requiring that the COM force and 'torque' is conserved via