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

(3R,6R,7R,10R,11R)-10-(tert-Butyl-dimethyl-silanyloxy)-3,11-diethyl-7-methyl-2-oxo-azacyclotetradecane-6-carboxylic acid methyl ester