(1S,3S,4S,5R,6R,7R)-6-((E)-(4S,6S)-4,6-Dimethyl-oct-2-enoyloxy)-4-hydroxy-1-[(4S,5R)-4-(4-methoxy-benzyloxymethoxy)-5-methyl-3-oxo-6-phenyl-hexyl]-7-triethylsilanyloxy-2,8-dioxa-bicyclo[3.2.1]octane-3,4,5-tricarboxylic acid tri-tert-butyl ester