(1R,3S,5R,7R,9R,13R,15S,18S)-7-(tert-Butyl-dimethyl-silanyloxy)-13-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-3-hydroxy-18-methyl-12,19,20-trioxa-tricyclo[13.3.1.15,9]icosan-11-one

[(2R,4R,6R)-4-(tert-Butyl-dimethyl-silanyloxy)-6-((S)-3-{(2R,3S,6S)-6-[(R)-2-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2-hydroxy-ethyl]-3-methyl-tetrahydro-pyran-2-yl}-2-hydroxy-propyl)-tetrahydro-pyran-2-yl]-acetic acid

[4-(tert-butyl-dimethyl-silanyloxy)-6-(3-{6-[2-(2,2-dimethyl-[1,3]dioxolan-4-yl)-2-hydroxy-1-(2,4,6-triisopropyl-phenylselanyl)-ethyl]-3-methyl-tetrahydro-pyran-2-yl}-2-hydroxy-propyl)-tetrahydro-pyran-2-yl]-acetic acid methyl ester