[(2,2-dimethylpropanoyl)oxy]methyl (6R,7R)-7-{[(2Z)-2-{2-[(tert-butoxycarbonyl)amino]-1,3-thiazol-4-yl}pent-2-enoyl]amino}-3-[(carbamoyloxy)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate