| 摘要 |
<p>Beta-lactam compounds of the formula (I): in which R1 and R2 are, independently of one another, a hydrogen atom or a lower alkyl group; M is a hydrogen atom, a protective group or a removable group which can easily be hydrolysed in the human body; R' and R" are, independently of one another, a hydrogen atom or a protective group; A is a group of the formula (a): in which R3 and R4 are, independently of one another, a hydrogen atom or a lower alkyl group, with the proviso that when R1 and R2 are hydrogen atoms, R3 and R4 are not hydrogen atoms, or is a mercapto group of the formula (b), (c), (d) or (e), or their pharmaceutically acceptable salts, process for the preparation thereof and pharmaceutical products containing them for treating diseases caused by microorganisms. <IMAGE></p> |
