2,7,15,17-OCTADECATETRAENE-1,13-DIOL, 5,11-BIS[[(1,1-DIMETHYLETHYL)DIMETHYLSILYL]OXY]-4,6,8,10,12,14-HEXAMETHYL-, 13-CARBAMATE, (2Z,4S,5S,6S,7Z,10S,11R,12R,13S,14S,15Z)-