since the intermediate activated matrix ( an imidazolyl carbamate-agarose ) is susceptible to nucleophilic attack by free amino groups , but is relatively stable to oxygen nucleophiles , ligands ranging from simple organic primary amines , amino acids , proteins and other biological substances , which contain amino group functionality , can be bound to the agarose via a n-alkylcarbamate ( urethane ) linkage .
C0006948
carbamate
C0041964
urethane