3-(5-nitro-2,4-dioxopyrimidin-1-yl)propanoic acid

(9ci)-2-(2-氨基乙基)-1H-苯并咪唑-5-甲腈

N-(6-氯-3-哒嗪基)-beta-丙氨酸

N-[(4-Phenoxyphenyl)sulfonyl]-β-alanine

3-[3-Methyl-3-(4-nitro-phenyl)-ureido]-propionic acid