| 摘要 |
A process for the preparation of an antibacterially active compound of the formula (I): <IMAGE> (I) and salts and esters thereof wherein R1 and R2 independently are hydrogen or an organic group, and R3 is an organic group bonded via a carbon atom to the sulphur atom, which comprises reacting a compound of the formula (II): <IMAGE> (II) wherein R4 is an organic group different to R3 and Ra is hydrogen or a carboxy-blocking group, with a thiol R3SH or reactive derivative thereof. In addition certain compounds within the formula (II) are novel and useful antibacterial agents in their own right. |
