Finally, the relaxation rate R 1 was measured from a G-CG simulation performed with ESPResSo . Short polymer chains consisting of 5 beads each were placed in a cubic box. The number of polymer molecules and the box dimensions were chosen to mimic the AA simulations. Results obtained from the G-CG simulations show that the value of R 1 is underestimated by a factor of ≈ 5 -7 by the G-CG model compared to AA (Fig. ), in good agreement with the results obtained from CoM-CG (Fig. ).