54450-67-8 EINECS 259-168-0 Sodium (2S-(2alpha,5alpha,6beta(S*)))-6-(2,2-dimethyl-5-oxo-4-phenylimidazolidin-1-yl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate