abstract |
PURPOSE:Cephalosporin analogues of formula I (Ar is phenyl, p-acyloxyphenyl, 2-thienyl, 3-thienyl) and carboxyl derivatives thereof; for example, 7alphamethoxy-7beta-(alpha-phenyl-alpha-carboxyacetamido)-3-(1-methylt etrazol-5-yl) thiomethyl1-oxadethia-3-cephem-4-carboxylic acid. |