L-Chlorosuccinic anhydride, L-bromosuccinic anhydride, and D,L-methylsuccinic anhydride react with 2-acetamido-2-deoxy-beta -D-glucopyranosylamine to give varying mixtures of N-4-(beta -GlcNAc)-2-substituted- and N-4-(beta -GlcNAc)-3-substituted-succinamic acid isomers. The two regioisomers are separated by anion exchange chromatography. The N-4-(beta -GlcNAc)-2-substituted-succinamic acid isomers are characterized as analogues of N-4-(2-acetamido-2-deoxy-beta -D-glucopyranosyl)-L-asparagine.