(E)-(S)-4-{(2R,4S,5S)-4-Hydroxy-6-methyl-2-(3-methyl-but-2-enyl)-5-[(5-methyl-isoxazole-3-carbonyl)-amino]-heptanoylamino}-5-((S)-2-oxo-pyrrolidin-3-yl)-pent-2-enoic acid ethyl ester

(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-((S)-tetrahydro-5-oxofuran-2-yl)-2-methylpropylcarbamate

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

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

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

(E)-(S)-4-{(2R,4S,5S)-4-(tert-Butyl-dimethyl-silanyloxy)-6-methyl-2-(3-methyl-but-2-enyl)-5-[(5-methyl-isoxazole-3-carbonyl)-amino]-heptanoylamino}-5-((S)-2-oxo-pyrrolidin-3-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

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

(4S,5S)-5-tert-Butoxycarbonylamino-4-hydroxy-6-methyl-heptanoic acid ethyl ester

(2S,4S)-2-(2-Amino-ethyl)-4-tert-butoxycarbonylamino-pentanedioic acid dimethyl ester