2-Thia-6-azabicyclo(4.2.0)oct-4-ene-5-carboxylic acid, 8-((5-ethyl-2-nitro-1-imidazolyl)acetamido)-4-hydroxymethyl-7-oxo-, acetate 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-(((5-ethyl-2-nitro-1H-imidazol-1-yl)acetyl)amino)-8-oxo-, (6R-trans)- 67855-52-1 BRN 5398148