4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(((3,4-dihydroxyphenyl)(((4-ethyl-2,3-dioxo-1-piperazinyl)carbonyl)amino)acetyl)amino)-6-(formylamino)-3,3-dimethyl-7-oxo-, monosodium salt, (2S-(2alpha,5alpha,6beta(S*)))-