7.beta.-(substituted)amino-3-substituted cephalosporanic acids a

7.beta.-Acyloxy-3-acetoxymethyl cephalosporins

7.beta.-Acyloxy-3-heterocyclicthiomethyl cephalosporins

7.beta.-Acyloxy-3-heterocyclicthiomethyl cephalosporins

7.beta.-Arylalkyl-3-methoxy or 3-hydroxy-4,5.alpha.-epoxy-6.beta

7.beta.-Arylalkyl-6.alpha., 7 .alpha.-oxymethylene-3-methoxy or

7.beta.-Arylalkyl-7.alpha.-methyl-6-oxo or 6.alpha.-hydroxy-3-me

7.beta.-Hydroxy-3-heterocyclicthio-methyl cephalosporin intermed

7.beta.-Phosphoramido-7.alpha.-methoxycephalosporanic acid deriv

7.beta.-substituted-4-aza-5.alpha.-androstan-3-ones as 5.alpha.-

7.beta.-[(2-Amino-1,2-dioxoethyl)amino]acyl cephalosporins

7.beta.-[2-Aryl-2-(etherified oximino)acetamido]-3-N-substituted

7.beta.-[2-Etherified oximino-2-(phenyl or naphthylacetamido)]ce

7.beta.-[2-Etherified oximino-2-(phenyl- or naphthylacetamido)]

7.beta.-[2-Etherified oximino-2-(thienyl-, furyl- or pyridylacet

7.beta.-[[[(2-Cyanomethyl)amino]-1,2-dioxoethyl]amino]acyl cepha

7.beta.-[[[2-Acylamino]-1,2-dioxoethyl]amino]acyl cephalosporins

7a-alkoxy-4H-pyrano[3,2-d]-oxazol-2(3H)-one and...

7H-1,3,4-Thiadiazolo-[3,2-a]-pyrimidin-7-one-5-carboxylic compou

7[-2-Alkoxyamino(acetamido)]cephalosporin derivatives