The core foldamer structure is shown in the dashed box, which can be decorated with different moieties at X-, R-, Y- and Z-positions indicated on the periphery. Foldamers possess an aromatic Sal or Benz backbone (Y=OMe or H), Arg, Lys or Cit side chains (R=Arg, Lys or Cit), short length (two to four repetitive units) and various N- (X=NH₂ or Ac) and C- (Z=NH₂, OH, OMe or β-Ala) terminal groups.