2-(Diethoxy-phosphoryl)-pentanedioic acid 5-tert-butyl ester 1-[(1R,2R,3S,4R)-3-[(4S,5S)-2,2-dimethyl-5-((E)-pent-3-enyl)-[1,3]dioxolan-4-ylmethyl]-2-[2-(4-methoxy-benzyloxy)-ethyl]-4-((E)-oct-6-enyl)-6-oxo-cyclohexyl] ester