(2S,3R,4S,5S)-3-[(S)-1-(benzyloxy)-2-methybutyl]-2-methoxycarbonyl-2-methyl-4-nitro-5-phenylpyrrolidine

(2S,3R,4S,5S)-3-((1S,2S)-1-Benzyloxy-2-methyl-butyl)-5-cyclohexyl-4-nitro-pyrrolidine-2-carboxylic acid methyl ester

(2S,3R,4S,5S)-3-[(1S,2S)-1-(benzyloxy)-2-methylbutyl]-4-nitro-5-phenylpyrrolidine-2-carboxylic acid

(2S,3R,4S,5S)-3-[(1S,2S)-1-(benzyloxy)-2-methylbutyl]-2-methyl-4-nitro-5-phenylpyrrolidine-2-carboxylic acid

(2S,3R,4S,5S)-3-[(1S,2S)-1-(benzyloxy)-2-methylbutyl]-5-cyclohexyl-4-nitropyrrolidine-2-carboxylic acid