Compounds of the formula (I) ##STR1## wherein R.sup.1 and R.sup.2 are H, methyl, or ethyl, provided that at least one of R.sup.1 or R.sup.2 is methyl or ethyl, have unexpected activity against ants. Compounds wherein at least one of R.sup.1 and R.sup.2 is methyl or ethyl are novel.

 
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