甲醛

4-phenyl-1,5-diazocan-2-one

(R,S)-N-(2-aminopropyl)-N-methyl-β-phenyl-β-alanine

4-苯基-2-氮杂环丁酮

(R,S)-N-(2-cyanoethyl)-N-methyl-β-phenyl-β-alanine