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Backbone conformational preferences predicted for Ac-Dbzg-NHMe (red triangles), Ac-Dϕg-NHMe (blue diamonds) and Ac-Aib-NHMe (green circles) at the B3LYP/6-31+G(d,p) level. Only minimum energy conformations with relative energies (ΔE) lower than 5.0 kcal/mol are indicated.
