The fragment-based correction to force fields was tested on ten organic molecules chosen to assess a variety of intermolecular interactions. These were selected from the X23 dataset 44 of crystal structures with reliable experimentally determined sublimation energies, or molecules that are known from previous studies to be problematic for force field energy models . So that our evaluation is focused on the intermolecular energy model, molecules were selected where the gas phase geometry optimization of the isolated molecule is in good agreement with the molecular geometry in the experimental crystal structure. The selected molecules are shown in Fig. along with the Cambridge Structural Database (CSD) reference codes of their known crystal structures. Five of these molecules are known to be polymorphic, so that our test set contains 16 experimentally determined crystal structures.