5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid,3-[(acetyloxy)methyl]-7-[[[[[(1-methylethyl)amino][(1-methylethyl)imino]methyl]thio]acetyl]amino]-8-oxo-, (6R,7R)-

5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid,3-[(acetyloxy)methyl]-7-[[[[[(1-methylethyl)amino][(1-methylethyl)imino]methyl]thio]acetyl]amino]-8-oxo-, (6R,7R)-