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Robust porous frameworks are formed by the dipeptides L-Ala-L-Val (see structure) and L-Val-L-Ala that have a high capacity and selectivity for gas sorption. The dipeptides assemble through hydrogen bonds as a 61 helix to form channels with average diameters of 5.13 and 4.90 Å, respectively.
Soldatov et al. (Tue,) studied this question.