(S)-3-mercapto-3-methyl-2-ureidobutanoic acid

(5S)-5-(2-sulfanylpropan-2-yl)imidazolidine-2,4-dione

5-isopropylidene-2-thioxo-imidazolidin-4-one

5-(α-mercapto-isopropyl)-imidazolidine-2,4-dione

2-氧代-3-甲基丁酸