(2R,4S,5R,6S,7S,9S)-5-(3-acetoxyoxetan-3-yl)-6-(benzoyloxy)-7-hydroxy-2-methoxy-4-[(1S)-1-methoxyethyl]-4,10,11,11-tetramethyl-3-oxobicyclo[5.3.1]undec-1(10)-en-9-yl (4R,5S)-4-(cyclohexa-2,4-dienyl)-2-(4-methoxyphenyl)-3-{[(2-methylprop-2-yl)oxy]carbonyl}-1,3-oxazolidine-5-carboxylate