2-acetamido-1-N-(1-benzyloxy-N-benzyloxycarbonyl-4-L-aspartyl)-2-deoxy-β-D-glucopyranosylamine

2-amino-5-hydroxy-4-oxopentanoic acid

5,5-二甲基-1,3-环己二酮

Ala-Ser-Asp-Gly

His-Ala-Asp-Gly