以下为句子列表：
英文: In a preferred embodiment, a .alpha.-hydroxy carboxylic acid with a specific chiral configuration is linked by an amide linkage to a .alpha.-amino acid specific with a specific chiral configuration or linked by an amide linkage to a peptide made up of .al
中文: 主要体现在，含有特定结构的α-羟基羧酸与一个含特定结构的α-氨基酸以氨基联接特异结合，或与一个有相同结构的，由α-氨基酸单体组成的肽以氨基联接相连。
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