4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(((((8-hydroxy-2-oxo-2H-1-benzopyran-3-yl)carbonyl)amino)phenylacetyl)amino)-3,3-dimethyl-7-oxo-, monosodium salt, (2S-(2alpha,5alpha,6beta(S*)))-