(S)-2-((tert-butoxycarbonyl)amino)-3-(2-thioxo-2,3-dihydro-1H-imidazol-4-yl)propanoic acid

(S)-3-(1-(tert-butoxycarbonyl)-2-thioxo-2,3-dihydro-1H-imidazol-4-yl)-2-((tert-butoxycarbonyl)amino)propanoic acid

D-组氨酸甲酯二盐酸盐

methyl (S)-2-<(1,1-dimethylethoxycarbonyl)amino>-3-(2-mercapto-1H-imidazol-4-yl)propionate