| 摘要 |
1. A compound of the formula I see diagramm : EP0050097,P10,F2 wherein X is hydrogen, halogen or pseudo halogen, R1 is hydrogen or a C1 -C6 -alkyl or phenyl group each of which is unsubstituted or substituted by halogen, hydroxyl or C1 -C3 -alkoxy, R2 is a C1 -C6 -alkyl, C2 -C6 -alkenyl, C2 -C6 -alkynyl or phenyl group, each of which is unsubstituted or substituted by halogen, hydroxyl or C1 -C3 -alkoxy, or R1 and R2 together form a tetramethylene, pentamethylene or hexamethylene bridge, each of which is unsubstituted or substituted by C1 -C3 -alkyl. |
