D-amino acids have properties that make them desirable drug and vaccine targets. Using a GGXGG host-guest pentapeptide system, we performed exhaustive sampling of the conformational propensities for both L- and D- amino acids. [1,2] Knowledge of such propensities can inform peptide design. These simulations included D-allo-isoleucine and D-allo-threonine, which are the forms of isoleucine and threonine obtained in vivo through α-epimerization, where the original side chain chiralities are retained. The total simualtion time 6.6 μ-seconds. The simulations were again performed according to our standard Dynameomics Protocol.