| 摘要 |
<p>Cephalosporin compounds are disclosed of the general formula (I> <IMAGE> wherein R<1> represents a hydrogen atom or a carboxyl blocking group; R<2> represents a hydrogen atom or an amino protecting group; R<3> and R<4> each represents a hydroxy or substituted hydroxy group or R<3> and R<4> together represent a cyclic protected diol group; Z is @S or @S->O ( alpha - or beta -); the dotted line bridging the 2-, 3-, and 4-positions indicates that the compound is a ceph-2-em or ceph-3-em compound; and non-toxic salts and solvates thereof.</p> |
