Natural Product Biomolecules - Organic Chemistry Concepts: An EFL Approach - page 162

in Section 7.8.3. Most peptides tend to favor the trans geometry shown in
Figure 8.19 .
FIGURE 8.19
Trans geometry of the peptide bond.
The structural features of peptide bonds combine with the effects of intramolecular
and intermolecular interactions. These control the chemical properties and overall
conformational shapes which are shown by these biomolecules. See Figure 8.20 .
+XPDQLQVXOLQ
FIGURE 8.20
Selected amino acids, a peptide, and a protein.