摘要 |
Compounds of the formula I <IMAGE> (I) wherein R1 represents hydrogen, C1-C3-alkyl or C1-C3-alkoxy, and R2 represents C1-C6-alkyl or C3-C4-alkenyl both optionally substituted by cyano, halogen, nitro, C1-C3-alkoxy or C1-C3-alkylthio, or C3-C8-cycloalkyl or C3-C8-cycloalkenyl both optionally substituted by C1-C3-alkyl. |