[2-[5-[6-(1-benzyloxymethyl-propyl)-4-cyano-2,2-dimethyl-[1,3]dioxan-4-yl]-2-(tert-butyl-dimethyl-silanyloxy)-pentyl]-4-(tert-butyl-dimethyl-silanyloxy)-2-methoxy-5-oxo-hexahydro-pyrano[4,3-b]pyran-7-ylmethyl]-phosphonic acid diethyl ester

3,29-bis-(tert-butyl-dimethyl-silanyloxy)-7-cyano-12-ethyl-1-methoxy-9,9-dimethyl-13,25-dioxo-15-propyl-8,10,14,31-tetraoxa-tricyclo[25.3.1.17,11]dotriaconta-17,19,21,23-tetraene-28-carboxylic acid methyl ester