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Document<br />

Figure 5<br />

Secondary structure modifications using β-turn α-turn, and β-sheet scaffolds.<br />

Page 566<br />

γ-turn mimetic, 27, illustrates an innovative approach to incorporate a retroamide surrogate between the<br />

i and i+1 amino acid residues with an ethylene bridge between the N' (i.e., nitrogen replacing the<br />

carbonyl C') and N atoms of the i and i+2 positions, and this template allows the possibility for all three<br />

side chains of the parent tripeptide sequence. Finally, the design of a β-sheet mimetic, 28, provides an<br />

attractive template to constrain the backbone of a peptide to that simulating an extended conformation<br />

[32]. The β-sheet is of particular interest to the area of protease-targeted peptidomimetic drug discovery.<br />

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