| 摘要 |
1. Compounds of the general formula (I) see diagramm : EP0197280,P11,F1 in which X represents oxygen or sulphur, R**1 and R**2 are identical or different and represent hydrogen, halogen or alkyl and R**3 represents halogen, and wherein, if R**1 represents 2-fluoro or 2-chloro, R**2 represents hydrogen, 6-fluoro or 6-chloro and R**3 represents fluorine, in those cases X represents sulphur. |
