[1(1S,2R),2S,3S]-3,5-bis(tert-butyl-dimethylsilyloxy)-2-methylpentanoic acid 2-(N-benzyl-N-mesitylenesulfonyl)amino-1-phenyl-propyl ester

[1(3Z,5R,6S,7S),3R]-N-{3-[7-(tert-butyl-dimethylsilyloxy)-9-oxo-4,6-dimethyl-5-triisopropylsilyloxy-non-3-enyl]-2,5-dimethoxy-phenyl}-3-methoxy--4-oxo-N-(2,2,2-trichloroethoxymethyl)-butyramide