(2Z,4E,6R,7R,8S,9S,10R,12E,14E,16S,17R,18R,19R,20R,21R)-21-(benzoyloxy)-19-((diethyl(isopropyl)silyl)oxy)-8-ethyl-17-hydroxy-2,16-dimethoxy-4,6,10,12,18,20-hexamethyl-7,9-bis((triethylsilyl)oxy)docosa-2,4,12,14-tetraenoic acid