(E)-(S)-4-[(2R,4S,5S)-5-tert-Butoxycarbonylamino-4-(tert-butyl-dimethyl-silanyloxy)-6-methyl-2-(3-methyl-but-2-enyl)-heptanoylamino]-5-((S)-2-oxo-pyrrolidin-3-yl)-pent-2-enoic acid ethyl ester

tert-butyl (S)-1-((2S,4R)-tetrahydro-4-(3-methylbut-2-enyl)-5-oxofuran-2-yl)-2-methylpropylcarbamate

4S-amino-5-(2-oxopyrrolidin-3S-yl)pent-2-enoic acid ethyl ester

(2R,4S,5S)-5-tert-Butoxycarbonylamino-4-hydroxy-6-methyl-2-(3-methyl-but-2-enyl)-heptanoic acid

D-Glutamic acid, N-[(1,1-dimethylethoxy)carbonyl]-, dimethyl ester