FIELD: pharmacology.
SUBSTANCE: invention concerns N-phenylphosphoric acid triamides of general formula (I), method of their obtainment and application as inhibition agents in enzymic hydrolysis of carbamide 
, where X is oxygen or sulphur; R1, R2, R3, R4 are selected out of hydrogen, C1-C8 alkyl, alcoxy, fluorine, chlorine, bromine, iodine, trifluoromethyl.
EFFECT: obtaining novel efficient urease inhibitors.
12 cl, 4 ex, 1 tbl
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