(5S,6S)-6-((E)-2-((4R,5R)-5-((R,Z)-2-((tert-butyldimethylsilyl)oxy)-4-iodobut-3-en-1-yl)-4-(2-hydroxyethyl)-2,2-dimethyl-1,3-dioxolan-4-yl)vinyl)-5-ethyl-5,6-dihydro-2H-pyran-2-one