(1R,3S,5R,7R,9R,13R,15S,18S)-3-methoxy-18-methyl-13-((E)-4-methylpent-1-en-1-yl)-11-oxo-12,19,20-trioxatricyclo[13.3.1.15,9]icosan-7-yl 2-(phenylselanyl)acetate

2-((2S,4S,6R)-4-bromo-6-((S)-2-methoxy-3-((2R,3S,6S)-3-methyl-6-((S,E)-6-methyl-2-((triisopropylsilyl)oxy)hept-3-en-1-yl)tetrahydro-2H-pyran-2-yl)propyl)tetrahydro-2H-pyran-2-yl)acetaldehyde