(E)-(4S,7R)-4-(4-Methoxy-benzyloxy)-7-(tetrahydro-pyran-2-yloxy)-oct-2-enoic acid ethyl ester

(E)-(4S,7R)-4-(4-Methoxy-benzyloxy)-7-(tetrahydro-pyran-2-yloxy)-oct-2-enoic acid (E)-(1R,2R)-2-(4-methoxy-benzyloxy)-1-methyl-4-[2-(toluene-4-sulfonyl)-ethoxycarbonyl]-but-3-enyl ester