4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[[(7-chloro-4-quinolinyl)amino]acetyl]amino]-3,3-dimethyl-7-oxo-,(2,2-dimethyl-1-oxopropoxy)methyl ester, (2S,5R,6R)-