FIELD: chemical industry. SUBSTANCE: described are new compounds of formula I: 
or salts thereof wherein R1 is C1-6 alkyl group; R2 is C1-6 alkylsulfonyl group; R3 is C1-6 alkyl group R4 is hydrogen and R is C1-6 alkyl group and herbicidal composition comprising compound I or salt thereof as active agent. EFFECT: selectivity of herbicidal activity to crops and weeds, more particularly corn. 4 cl, 4 ex, 2 tbl
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