(4R-(4alpha,5beta,6E))-6-(2-Hydroxyethylidene)-4-methyl-7-oxo-3-((2-pyridinylmethyl)thio)-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid 1-Azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(2-hydroxyethylidene)-4-methyl-7-oxo-3-((2-pyridinylmethyl)thio)-, (4R-(4alpha,5beta,6E))- 140631-65-8 6-(2'-Hydroxyethylidene)-4-methyl-3-(2-(methylthio)pyridinyl)-7-oxo-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylate 6-(2-Hydroxyethylidene)-4-methyl-7-oxo-3-((2-pyridinylmethyl)thio)-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid (4R-(4alpha,5beta,6E))- Hemphac