FIELD: organic chemistry, heterocyclic compounds. SUBSTANCE: invention proposes condensed heterocyclic derivative of the formula (I): 
where R - hydrogen, hydroxyl, C1-C6-alkoxy, optionally substituted with C1-C6-alkylcarbonylhydroxy, C1-C6-alkoxy, C1-C6-alkoxy, C1-C6-alkoxy-, C1-C6-alkoxycarbonyl-C1-C6-alkylcarbonyl, tri-C1-C6-alkylsilyl-C1-C6-alkoxy, benzylhydroxy-group that can be optionally substituted with C1-C6-alkoxy, C2-C6-alkenylhydroxy, group NR6R7 where R6 and R7 together with nitrogen atom form imidazolyl; R3 and R4 can be similar or different and mean C1-C6-alkoxy optionally twice substituted with halogen, C1-C6-alkyl; W - oxygen or sulfur atom; Z means methine group; A - possibly substituted 5- or 6-membered heterocyclic ring. Invention proposes also agent including condensed heterocyclic derivative of the formula (I) taken at effective amount that can be used for treatment fields and plant leaves. Agent of the formula (I) shows high herbicide activity with respect to cereal and noncereal weed without negative effect on crops. EFFECT: improved method of synthesis, enhanced effectiveness of herbicides. 10 cl, 82 tbl
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