27920-90-7 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-((4-carboxy-1-oxobutyl)amino)-8-oxo-, (6R-trans)- Gl-7-Aca Glutaryl-7-aca Glutaryl-7-aminocephalosporanic acid