ethyl (2S,3S)-3-(Boc-amino)-3-<3-(tert-butylsulfamoyl)phenyl>-2-<(4-methoxybenzyl)sulfanyl>propanoate

(2R,3R), 3-benzyloxycarbonylamino-2-[4-methoxybenzylsulfanyl]-5-neopentyloxysulfonyl-pent-4-enoic acid tertiobutyl ester

(2R,3R), 3-benzyloxycarbonylamino-2-[4-methoxybenzylsulfanyl]-hex-4-ene-1,6-dioic acid 6-benzyl ester 1-tertiobutyl ester

(2R,3R), 3-benzyloxycarbonylamino-2-[4-methoxybenzylsulfanyl]-5-[dibenzyloxyphosphoryl]-pent-4-enoic acid tertiobutyl ester

methyl (2S,3S)-5-(tert-butylsulfamoyl)-3-(Cbz-amino)-2-<(4-methoxybenzyl)sulfanyl>pentanoate