((S)-1-{(S)-1-[(S)-1-((2S,4R)-4-Methyl-5-oxo-tetrahydro-furan-2-yl)-pent-4-enylcarbamoyl]-ethylcarbamoyl}-pent-4-enyl)-carbamic acid tert-butyl ester

(S)-2-[N(2)-[(tert-butyloxy)carbonyl]amino]-N-methoxyl-N-methyl-5-hexenoic amide

(S)-5-((S)-1-Amino-pent-4-enyl)-dihydro-furan-2-one

(3R,5S)-5-((S)-1-Amino-pent-4-enyl)-3-methyl-dihydro-furan-2-one

(S)-2-((S)-2-tert-Butoxycarbonylamino-hex-5-enoylamino)-propionic acid