{[(2S,3R,4S,5S)-3-((1S,2S)-1-Benzyloxy-2-methyl-butyl)-4-nitro-5-phenyl-pyrrolidine-2-carbonyl]-amino}-acetic acid methyl ester

{[(2S,3R,4S,5S)-3-((1S,2S)-1-Benzyloxy-2-methyl-butyl)-5-cyclohexyl-4-nitro-pyrrolidine-2-carbonyl]-amino}-acetic acid methyl ester

(2S,3R,4S,5S)-3-[(1S,2S)-1-(3,5-Difluoro-benzyloxy)-2-methyl-butyl]-4-nitro-5-phenyl-pyrrolidine-2-carboxylic acid methyl ester

(2S,3S)-2-(benzyloxy)-3-methylpentanal

methyl (2S,3S)-2-(3,5-difluorobenzyloxy)-3-methylpentanoate