(S)-ethyl 2-(2-aminopropylamino)-4-methylthiazole-5-carboxylate 、
(S)-ethyl 2-(1-aminopropan-2-ylamino)-4-methylthiazole-5-carboxylate 以the title compound was obtained as a colorless solid (52%)的产率得到(S)-ethyl 4-methyl-2-(5-methyl-2-oxoimidazolidin-1-yl)thiazole-5-carboxylate