3-(4-Cyclopropyl-2,5-dioxoimidazolidin-4-yl)propanoic acid
3-(4-Methyl-2,5-dioxoimidazolidin-4-yl)propanoic acid
2-(3-Methyl-2,5-dioxoimidazolidin-1-yl)acetic acid
Methyl 2-(2,5-dioxoimidazolidin-4-yl)acetate
