With a MUE of 14%, QUBE performs better than both OPLS-AA and OPLS-AA/L, which have errors of 23% and 21% respectively. The error is not as low as OPLS-AA/M, which has an error of 10%, however with further empirical changes to the torsional parameters the error could likely be further reduced. Examining individual dipeptide errors, protonated histidine and aspartic acid are found to have the highest errors. The protonated histidine experimental data includes all ionization states of histidine and therefore may not be accurate, which would explain the high error. The higher error in the simulated dynamics of the aspartic acid dipeptide is more problematic and, in future versions of the QUBE force field, further changes to these sidechain torsional parameters may be considered.