Figure 5: Molecular conformation of the tripeptide Boc-β2,2Ac6c-β2,2Ac6c- β2,2Ac6c-OMe, which has a C6 hydrogen bond at β2,2Ac6c(1) and a non-helical ββ C10 hydrogen bond with reversed directionality, at the β2,2Ac6c(2)- β2,2Ac6c(3) segment. The backbone dihedral angles are marked [9-14].