4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-((5-(acetylamino)-5-carboxy-1-oxopentyl)amino)-3,3-dimethyl-7-oxo-, disodium salt, (2S-(2alpha,5alpha,6beta(R*)))- 84713-89-3 N-Acetylisopenicillin