| 摘要 |
<p>There are disclosed compounds of formula (I) wherein R?1 and R2¿ independently represent hydrogen or halogen, R?3 and R4¿ independently represent phenyl, or alkyl C¿1-6? optionally substituted by one or more substituents selected from OR?5¿, alkylthio C¿1-6?, NR?6R7¿, phenyl, COOR8 and halogen, R?5, R6, R7 and R8¿ independently represent hydrogen or alkyl C¿1-6?, and X represents an acidic moiety, and pharmaceutically acceptable salts thereof. Processes for their production and pharmaceutical compositions and methods of treatment involving their use are also described.</p> |
