(6R,7R)-3-[[(Aminocarbonyl)oxy]methyl]-7-[[(2Z)-2-(2-amino-4-thiazolyl)-1-oxo-2-pentenyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid, (2,2-Dimethyl-1-oxopropoxy)methyl Ester

5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,3-[[(aMinocarbonyl)oxy]Methyl]-7-[[(2Z)-2-(2-aMino-4-thiazolyl)-1-oxo-2-penten-1-yl]aMino]-8-oxo-,(2,2-diMethyl-1-oxopropoxy)Methyl ester, (6R,7R)-