8,13,21,23-Tetracosatetraenoic acid,19-[(aminocarbonyl)oxy]-11,17-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-5,7-dihydroxy-10,12,14,16,18,20-hexamethyl-, ethyl ester,(5R,7S,8Z,10S,11S,12S,13Z,16S,17R,18R,19S,20S,21Z)-