[(3S,4S)-3-((S)-1-Hydroxy-2-methyl-propyl)-1-[(S)-1-(4-methoxy-phenyl)-ethyl]-2-oxo-4-(2-oxo-2,5-dihydro-furan-3-yl)-azetidin-3-yl]-carbamic acid tert-butyl ester

[(3S,4S)-3-((S)-1-Hydroxy-2-methyl-propyl)-1-[(S)-1-(4-methoxy-phenyl)-ethyl]-2-oxo-4-(2-trimethylsilanyl-furan-3-yl)-azetidin-3-yl]-carbamic acid tert-butyl ester