(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

(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

O-[(tert-butyldimethylsilyl)oxy]fluvirucinin B1