7[(Furanyl-2-acetamido)-2-acetamido]cephalosporin derivatives
7[2(2,3 Dioxopiperazin-1-yl-carbonylamino)substituted 2 phenylac
7[2(Substituted phenyl)2-(amino)acetamido]cephalosporin derivati
7[2-(2-aminothiazol-4-yl)-2-benzyloximino]acetamido-3[4-al kyl-5
7[2-Hydroxyiminoacetamido]cephalosporins
7[3,6-Dihydro-1(2H)-p yridyl]-2-oxo-2H-[1,2,4]oxadiazolo[2,3-c]p
7[4-(5 methyl-2-oxo-1,3-dioxalen-4-yl)methyl 1-piperzinyl]-4-oxo