(S)-2-[Allyl-(4-nitro-benzenesulfonyl)-amino]-propionyl chloride

(S)-2-[Allyl-(4-nitro-benzenesulfonyl)-amino]-propionyl fluoride

(S)-2-[Allyl-((S)-2-tert-butoxycarbonylamino-3-methyl-butyryl)-amino]-propionic acid

(S)-2-[Allyl-((2S,3S)-2-tert-butoxycarbonylamino-3-methyl-pentanoyl)-amino]-propionic acid

[(S)-1-(Allyl-{(S)-1-[(S)-1-((2S,4R)-4-methyl-5-oxo-tetrahydro-furan-2-yl)-pent-4-enylcarbamoyl]-ethyl}-carbamoyl)-2-methyl-propyl]-carbamic acid tert-butyl ester