(1S,2R,3Z,5E,7S,9Z,11Z,13S,15R,19R)-7-hydroxy-1,4,10,19-tetramethyl-17,18-dioxo-2-[(2-oxopropanoyl)amino]-16-oxabicyclo[13.2.2]nonadeca-3,5,9,11-tetraen-13-yl pentanoate