(R)-4-(2,2-Dimethyl-4,6-dioxo-[1,3]dioxan-5-yl)-2-ethyl-butyric acid benzyl ester

(4R,5S)-1-((R)-5-Azido-2-ethyl-pentanoyl)-3,4-dimethyl-5-phenyl-imidazolidin-2-one

(E)-(3R,6R,7R,10S,11R)-10-(tert-Butyl-dimethyl-silanyloxy)-3,11-diethyl-7-methyl-2-oxo-azacyclotetradec-8-ene-6-carboxylic acid methyl ester

(E)-(9R,15R,16S,19R)-16-(tert-Butyl-dimethyl-silanyloxy)-9,15-diethyl-3,3,19-trimethyl-2,4-dioxa-11-aza-spiro[5.13]nonadec-17-ene-1,5,10-trione

(R)-4-[5-((E)-(1R,4S,5R)-8-Azido-5-ethyl-4-hydroxy-1-methyl-oct-2-enyl)-2,2-dimethyl-4,6-dioxo-[1,3]dioxan-5-yl]-2-ethyl-butyric acid benzyl ester