FIELD: agriculture. SUBSTANCE: product: lignin derivative. Yield up to 98%. The product comprises (wt%): 41.3 C; 11.2 Cu; 8.3 N; 1.2 H; 0 31.4; 6.6 F. Reagent 1: hydrolytic lignin. Reagent 2: nitric acid solution containing 5-30 N and 5-20 Cu. Reaction conditions: 60-80 C, preferably in the presence of 0.3-20 wt% HF. EFFECT: improved properties of the biocide. 2 cl, 4 tbl
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