[(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

((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

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

{(3S,6S,13S)-13-[(1S,3R)-3-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-1-hydroxy-butyl]-3-methyl-2,5-dioxo-1,4-diaza-cyclotridec-6-yl}-carbamic acid tert-butyl ester

[(3S,6S,13S)-3-Methyl-13-((2S,4R)-4-methyl-5-oxo-tetrahydro-furan-2-yl)-2,5-dioxo-1,4-diaza-cyclotridec-6-yl]-carbamic acid tert-butyl ester