(3S,5S,6R)-3-(4-Acetoxy-butyl)-2-oxo-5,6-diphenyl-morpholine-4-carboxylic acid benzyl ester
(3S,5S,6R)-3-{4-[(2S,3R,6R)-6-(2-Benzyloxycarbonylamino-ethyl)-2,3-diphenyl-morpholin-4-yl]-butyl}-2-oxo-5,6-diphenyl-morpholine-4-carboxylic acid benzyl ester
(S)-2-tert-Butoxycarbonylamino-6-(toluene-4-sulfonyloxy)-hexanoic acid ethyl ester