| 摘要 |
Novel compounds are disclosed having the formula <IMAGE> in which R is selected from the group consisting of alkoxy having from 1 to 6 carbon atoms, cycloalkyl having from 3 to 6 carbon atoms, alkyl having from 1 to 6 carbon atoms, thioalkyl having from 1 to 6 carbon atoms, chloroalkyl having from 1 to 6 carbon atoms, alkynyl having from 2 to 6 carbon atoms and <IMAGE> wherein R2 is alkyl having from 1 to 6 carbon atoms or alkoxy having from 1 to 6 carbon atoms, and R3 is hydrogen or alkyl having from 1 to 6 carbon atoms.
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