Amino-PEG4-benzyl ester contains a amino group and a benzyl ester group. The amino group readily react with carboxylic acids and activated esters to form amide bond. It can also react with carbonyl groups such as ketone and aldehyde under reductive amination condition to form C-N bond. The benyl ester can be removed by acid/base saponification and hyrogenation. The resulting acid group is a widely used functional group for bioconjugations.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.