Oxacyclodocosa-3,5,11-trien-2-one,8,10,14,20-tetrakis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-7,13,15,17,21-pentamethyl-22-[(1S,2Z)-1-methyl-2,4-pentadienyl]-,(3Z,5E,7R,8S,10S,11Z,13S,14R,15S,17S,20R,21R,22S)-