FIELD: agriculture. SUBSTANCE: herbicide agent has 0.5-90% compound of the formula (I) where R1 - halogen, hydroxyl, amino-, nitro-, cyano-, lower alkyl, C5-C7-cycloalkyl, trifluoromethyl, C1-C6-alkoxy, C1-C4-alkylthio, phenoxy, C1-C4-alkylsulfonyl; R2 - hydrogen, halogen, nitro, C1-C4-alkyl, C1-C4-alkoxy; n = 1, 2; m = 0, 1; R3 - hydroxyl, halogen, CO(O)ZR4, OCOCO)N(R5)2; R4-C1-C12-alkyl, C5-C7-cycloalkyl, phenyl, lower alkyl substituted with phenyl; R5-C1-C4-alkyl; Z - simple bond, oxygen or sulfur; X - halogen. Composition is used for struggle against weeds at the dose of active substance consumption 0.2-1.688 kg/ha. Structure of compound of the formula (I) is given in invention description. EFFECT: improved method of synthesis, increased effectiveness of herbicide. 4 cl, 14 tbl
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