(3S,4R)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-[(1R,4R)-4-(2-methoxy-ethyl)-2-oxo-cyclohexyl]-azetidin-2-one

(3S,4R)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-{(1R,4R)-4-[(E)-3-(1,3-dimethyl-2-oxo-2λ5-[1,3,2]diazaphospholidin-2-yl)-allyl]-2-oxo-cyclohexyl}-azetidin-2-one