The second series comprises a series of small proteins. The structures of the proteins were obtained from the study of Kulik et al. We used the structures optimized at ω-PBEh 62-64 /6-31G level of theory. The structures were manually inspected for problems, and proteins with proton transfers or other structural issues were excluded as this is outside of the applicable domain of our CP 3 . After also considering computational limitations, a total of 13 small proteins remained the PDB ids of which are: 1LVQ, 1V46, 1Y49, 1YJP, 2JTA, 2OL9, 2ONW, 2OQ9, 2PJV, 3FTK, 3FTR, 3FVA, and 3NVG. The selected proteins contain between 6 and 24 amino acids, which translates to between 70 and 312 atoms.