A polyamide moiety comprising at least one unit of formula I: -β1-X1-Y1-X3-X4-β3- (I) wherein: Y1 is either X2-β2 or β2-X2; β1 is -Rβ -CH2-NH- βa-, wherein βa is a β-alanine residue and Rβ is chosen from optionally substituted C1-7 alkylene, C1-7 alkenylene and C1-7 alkynylene groups; β2 and β3 are β-alanine residues; and X1, X2, X3 and X4 are independently fragments of formula (II): wherein E is an optionally substituted C5-6 heteroarylene group.
一种聚酰胺基团,包括至少一个I式单位:-β1-X1-Y1-X3-X4-β3-(I),其中:Y1是X2-β2或β2-X2;β1是-Rβ-
CH2-NH-βa-,其中βa是
β-丙氨酸残基,Rβ选择自可选择取代的C1-7烷基,C1-7烯基和C1-7炔基;β2和β3是
β-丙氨酸残基;X1、X2、X3和X4分别是式(II)的片段:其中E是可选择取代的C5-6杂
芳烃基。