Complete acid hydrolysis of the peptide followed by amino acid analysis yielded equimolar amounts of Leu, Orn, Phe, Pro, and Val. Orn is ornithine, an amino acid not present in proteins but present in some peptides. It has the structure

• 此肽完全水解,然后经氨基酸分析产生等摩尔的leu,Orn,Phe,Pro和Val，Orn为鸟氨酸，是蛋白质中不存在而存在于某些肽中的一种氨基酸。其结构如下