Fig. 3. The periodic rippled antiparallel β-sheet [FWF:fwf]_n layer, shown in two orthogonal projections (A and B). Dihedral angles in [°]; H-bond distances in [Å]; (l,l,l)-tripeptides in green; (d,d,d)-tripeptides in purple. Packing in the crystallographic lattice; four symmetry-equivalent columns shown (C).