4-nitro-N-((2R(syn),3S)-3-(N-benzyloxycarbonylamino)-2-hydroxy-4-phenylbutyl)-N-isobutyl-benzenesulfonamide

N-(S)-tetrahydrofuran-3-yloxycarbonyl-L-phenylalanine

(3S)-1-chloro-2-oxo-3-N-((S)-tetrahydrofuran-3-yloxycarbonylamino)-4-phenylbutane

(2S,3S)-1-chloro-2-hydroxy-3-N-((S)-tetrahydrofuran-3-yloxycarbonylamino)-4-phenylbutane

tert-butyl (4S)-4-N-((S)-tetrahydrofuran-3-yloxycarbonylamino)-2-chloro-5-phenyl-3-oxo-pentanoate