(2S,3S)-1-(2-nitro-3-benzyloxy-4-methylbenzoyl)-3-methyl-2-aziridinecarbonyl-D-valylproline t-butyl ester
(2-nitro-3-hydroxy-4-methylbenzoyl)treonyl-D-valylprolylsarcosyl-N-methylvaline(treonine hydroxyl) lactone
(2S,3S)-1-trityl-3-methyl-2-aziridinecarbonyl-D-valylproline t-butyl ester
N-(benzyloxycarbonyl)threonyl-D-valylproline t-butyl ester