The CG model was parameterised using the iterative Boltzmann inversion (IBI) method, which has been used previously to systematically coarse-grain OSCs. This method aims to match the local structural distribution functions between equivalent AA and CG systems via iterative optimisation of the CG interaction potentials. We followed the procedure outlined in refs 76 and 51, with the potential at each iteration, U n+1 (x), updated according to