It is noted that all long-range parameters are computed using single molecules in gas phase, which is an essential approximation. One concern is that strong intermolecular interactions (such as hydrogen bonds) can induce charge transfer between molecules, which changes the long-range interaction. To test how important this effect is, we also demonstrate the accuracy of our long-range force fields on fragments which have hydrogen bonds. Figure (a) and (c) illustrate the total, electrostatic, polarization, and dispersion energies between monomer A and B, as calculated by SAPT2+(3)δMP2 and NN-based long-range force field at various distances. Figure also presents these four energy components for another four dimers at varying distances. In all cases, monomer A consists of two protein fragments with hydrogen bonds, while monomer B comprises a single protein fragment. For all the dimers, excellent agreement between SAPT2+(3)δMP2 and long-range force field for all different energy components is observed when the distances between two monomers are larger than 3.5 Å, with the maximum error on total energy only about 1 kcal/mol. All these results