Figure 2:
Chemical structure of some β
3
-amino acid residues: β
3
- HAla → β
3
-homoalanine; β
3
-HVal → β
3
-homovaline; β
3
-HLeu → β
3
-homoleucine; β
3
-HPhe → β
3
-homophenylalanine; β
3
-HPro → β
3
- homoproline.
