2-Propenoic acid, 3-[(2R,3S,5R)-5-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]tetrahydro-2-furanyl]-2-[[(phenylmethoxy)carbonyl]amino]-, 1,1-dimethylethyl ester, (2Z)-