6-Undecenamide,3,5-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-11-[(2S,3S)-3-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]oxiranyl]-N-methoxy-N,5,6,10-tetramethyl-8-methylene-, (3S,5R,6E,10R)-