1,1'-[[(pentane-1,5-diyl)dioxy]bis[(2S,4R)-[5-methoxy-1,4-phenylene-2-(2,2,2-trichloroethoxycarbonylamino)]carbonyl]]bis[2-(tert-butyldimethylsilyloxymethyl)-4-hydroxyacetylpyrrolidine]

(2S,4R)-2-t-butyldimethylsilyloxymethyl-4-oxyacetylpyrrolidine

(2S,4R)-N-(benzyloxycarbonyl)-2-t-butyldimethylsilyloxymethyl-4-oxyacetylpyrrolidine

1,1'-[[(pentane-1,5-diyl)dioxy]bis[(2S,4R)-(5-methoxy-2-nitro-1,4-phenylene)carbonyl]]bis[2-(tert-butyldimethylsilyloxymethyl)-4-hydroxyacetylpyrrolidine]

(2S,4R)-N-(benzyloxycarbonyl)-2-t-butyldimethylsilyloxymethyl-4-hydroxypyrrolidine