| prov:value
| - Preferred cycloalkyl radicals are cyclopropyl, cyclopentyl or cyclohexyl.The phenyl, benzyl and phenethyl groups denoted by R.sub.1 can be unsubstituted on the rings, or substituted, for example, by methoxy, halogen atoms such as fluorine, chlorine, bromine and/or iodine, preferably chlorine, and/or C.sub.1 -C.sub.5-alkyl.Of special importance because of their effectiveness are compounds of formul
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