(2S,3R)-2-tert-Butoxycarbonylamino-3-[1-(2,4-dinitro-phenyl)-1H-imidazol-4-yl]-3-hydroxy-propionic acid

(2S,3S,4R)-4-{(2S,3R)-2-tert-Butoxycarbonylamino-3-[1-(2,4-dinitro-phenyl)-1H-imidazol-4-yl]-3-hydroxy-propionylamino}-3-hydroxy-2-methyl-pentanoic acid methyl ester

(2S,3S,4R)-4-[(2S,3R)-2-tert-Butoxycarbonylamino-3-hydroxy-3-(1H-imidazol-4-yl)-propionylamino]-3-hydroxy-2-methyl-pentanoic acid