ethyl 4-methyl-2-(2-oxo-3-phenylimidazolidin-1-yl)thiazole-5-carboxylate 、 2-(3-Ethyl-2-oxoimidazolidin-1-yl)-4-methylthiazole-5-carboxylate 以the title compound was obtained in 80% yield的产率得到2-(3-ethyl-2-oxoimidazolidin-1-yl)-4-methylthiazole-5-carboxylic acid