On the right side of Figure , the same six alkane molecules are dissolved in the BEN solvent. Similarly, the MAD value of the solvation free energies relative to their AA models is 1.3 kJ/mol, demonstrating a high accuracy comparable to that in the CHE solvent. This indicates that the CG models built using the AEX method exhibit good transferability across models and can effectively reproduce key properties such as the density, RDF, and solvation free energies at the AA level, especially for non-polar molecular systems dominated by LJ interactions. By contrast, the right side of Figure reveals poorer results for the solvation free energies of the six polar molecules in BEN. The MAD value for these cases is 6.5 kJ/mol, which is 4.1 kJ/mol higher than in the CHE case. Notably, for the NBN molecule, the maximum absolute deviation reaches 10.1 kJ/mol. This suggests that in BEN solutions, polar molecules with larger dipoles exert strong polarization effects on BEN, generating dipole-charge interactions that cannot be neglected in the electrostatic interactions. In our future research, we will further develop coarse-grained models for polar molecules, incorporating accurate descriptions of electrostatic interactions within the models to address these discrepancies.