(2R,4S,5R)-2-[(E)-(R)-1-(tert-Butyl-diphenyl-silanyloxy)-but-2-enyl]-4-methyl-5-phenyl-3-(toluene-4-sulfonyl)-oxazolidine

(2R,4S,5R)-2-[(E)-(S)-1-(tert-Butyl-diphenyl-silanyloxy)-but-2-enyl]-4-methyl-5-phenyl-3-(toluene-4-sulfonyl)-oxazolidine