| 摘要 |
PURPOSE:Cephalosporin analogues of formula I (A,B are H,aminoprotecting group;X is OH, carboxyl-protecting group;Y is H, methoxy;when A is H, B is a radical other than H and phenylglycyl);for example, 1-oxadethia3-methyl-7-phenyl acetamido-3-cephem-4-carboxylic acid. |
