Similarly, SAscore values for five datasets are close to the reference; molecules designed from ChemDiv soluble, FooDB, and UNPD-A present higher means (Figure ). This result could be associated with the complexity penalty of SAscore. In the case of ChemDiv soluble, another hypothesis is that the fragments could be more difficult to obtain because solubility issues are usually part of the optimization process. Of note, only 19 molecules of the 5575 (0.34%) have a SAscore greater than six. To compare the structural diversity of the generated databases from different fragment sources, the Tanimoto coefficient was used along with MACCS Keys (166-bits) and ECFP4 (1024 bits) fingerprints.