7-{(4S,5R)-5-[(R)-1-(4-Methoxy-benzyloxy)-prop-2-ynyl]-2-oxo-[1,3]dioxolan-4-yl}-heptanoic acid methyl ester

7-{(4S,5R)-5-[(R)-1-(4-Methoxy-benzyloxy)-7-trimethylsilanyl-hepta-2,4,6-triynyl]-2-oxo-[1,3]dioxolan-4-yl}-heptanoic acid methyl ester