(S)-3-Methyl-2-[(Z)-(7S,8R,9S)-7,8,9-tris-benzyloxy-9-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-non-5-enoylamino]-butyric acid tert-butyl ester

(R)-3-Methyl-2-[(5S,6S,7S,8R,9S)-7,8,9-tris-benzyloxy-9-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-5,6-dihydroxy-nonanoylamino]-butyric acid tert-butyl ester

(R)-3-Methyl-2-((5S,6S,7S,8S,9S,10R)-5,6,7,8,9-pentakis-benzyloxy-10,11-dihydroxy-undecanoylamino)-butyric acid tert-butyl ester

(S)-3-Methyl-2-((5S,6S,7S,8S,9S,10R)-5,6,7,8,9-pentakis-benzyloxy-10,11-dihydroxy-undecanoylamino)-butyric acid tert-butyl ester

(R)-3-Methyl-2-[(5S,6S,7S,8S,9S)-5,6,7,8,9-pentakis-benzyloxy-9-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-nonanoylamino]-butyric acid tert-butyl ester