(R)-6-[(E)-(3R,4R)-4-Hydroxy-3-methyl-3-triethylsilanyloxy-5-(2-trimethylsilanylethynyl-[1,3]dithian-2-yl)-pent-1-enyl]-5,6-dihydro-pyran-2-one

(R)-6-[(E)-(3R,4R)-4-(4-Methoxy-benzyloxy)-3-methyl-6-oxo-3-triethylsilanyloxy-8-trimethylsilanyl-oct-1-en-7-ynyl]-5,6-dihydro-pyran-2-one