(1S,2S,3R,4S,7R,9S,10S,12R,15S)-15-{[(6S,7R)-7-hydroxy-2,2-dimethyl-4,8-dioxo-6-phenyl-5-aza-3-oxaoct-8-yl]oxy}-4-acetoxy-1-hydroxy-9,12-dimethoxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.04,7.03,10]heptadec-13(14)-en-2-yl (2E)-2-methylbut-2-enoate