(3S,4R,5S,6S)-6-[(7E,11E,15E)-(1R,2R,13S,17S,19R)-11-Ethyl-2-hydroxy-1,7,13,17-tetramethyl-19-(2-methyl-[1,3]dioxolan-2-yl)-4-oxo-icosa-7,11,15-trienyl]-4-methoxy-3,5-dimethyl-tetrahydro-pyran-2-one