| 摘要 |
A compound of formula wherein R1 is unsubstituted or substituted aryl or heteroaryl, the substituents of the aryl and heteroaryl rings being selected, for example, from the group consisting of OH, halogen, CN, NO2, C1-C6alkyl, C3-C8cycloalkyl, C1-C6alkyl-C3-C8cycloalkyl, C3-C8cycloalkyl-C1-C6alkyl, C1-C6haloalkyl, C3-C8halocycloalkyl, C1-C6alkoxy and phenyl; phenoxy; phenylthio; phenylamino; and phenyl-(C1-C6alkyl)-amino; the substituents of the phenoxy, phenylthio, phenylamino and phenyl-(C1-C6alkyl)-amino groups being selected from the group consisting of halogen, CN, NO2, C1-C6alkyl, C3-C8cycloalkyl, C1-C6haloalkyl, C3-C8halocycloalkyl, C1-C6alkoxy, C3-C8cycloalkoxy, C1-C6alkylthio, C3-C8cycloalkylthio, C1-C6haloalkylthio and C3-C8halocycloalkylthio; R2 is, for example, H, OH, halogen, CN, NO2, C1-C6alkyl or C1-C6alkoxy; A is, for example, a single bond, C1-C12alkylene, O or O(C1-C12alkylene); R4 is H, C1-C6alkyl, C3-C8cycloalkyl, C1-C6haloalkyl, C1-C6alkoxy, N(R5)2 or C1-C<highlight><subs
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