(2E,4S,6S,7S,8R,9E,11E,13E)-1-[(t-butyldimethylsilyl)oxy]-3,7,9,13-tetramethyl-8-methoxy-14-(2'-methyl-4'-oxazolyl)-6-(p-nitrobenzoate)-4-[(triisopropylsilyl)oxy]-2,9,11,13-tetradecatetraene