(6E,10E,14E)-(3R,5S,9S,20S,21R)-11-Ethyl-20-hydroxy-21-((2S,3S,4R,5S)-4-methoxy-3,5-dimethyl-6-oxo-tetrahydro-pyran-2-yl)-3,5,9,15-tetramethyl-docosa-6,10,14-triene-2,18-dione