(6R,7R)-7-{[(2-amino-1,3-thiazol-4-yl)(formylamino)acetyl]amino}-8-oxo-3-[(1,2,3-thiadiazol-5-ylsulfanyl)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid