FIELD: agriculture. SUBSTANCE: compounds having formula 
where R1 is methyl, ethyl or isopropyl; R2 is alkyl, aralkyl, cycloalkyl, cycloalkylmethyl, aryl, heterocyclic group or thio group being substituted by heterocyclic group; R3 is hydrogen, methyl or ethyl; or R2 together with R3 represent -(CH2)n where n=3,4 or 5 and A is aromatic heterocyclic group; and salts thereof are proposed as antihelminth, acaricide and insecticide agents. EFFECT: improved quality. 20 cl, 4 tbl
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