The invention relates to N-phenylphosphonic acid triamides of general formula (I), to a method for the production thereof and to their use as agents for regulating or inhibiting enzymatic urea hydrolysis. In formula (I), X represents oxygen or sulfur R1 , R2 , R3 , R4 , R5 , independent of one another, represent hydrogen C1-C8 alkyl/hoteroalkyl, C2-C8 alkenyl/heteroalkenyl, C2-C8-alkynyl/heteroalkynyl, C3-C8 cycloalkyl/heterocycloalkyl, C3-C8cycloalkenyl/heterocycloalkenyl, C6-C10 aryl/C5-C10 heteroatyl, aralkyl, heteroarylalkyl, alkaryl, alkheteroaryl, alkoxy, aryloxy, hetaryloxy, alkylthio, arylthio, hetarylthio, acyl, aroyl, hetaroyl, acyloxy, aroyloxy, hetaroyloxy, alkoxycarbonyl, aryloxycarbonyl, hetaryloxycarbonyl, alkylsulfonyl, fluorine, chlorine, bromine, iodine, cyano, nitro, sulfo, carbonyl, carboxy, carbamoyl, sulfamoyl, with the provision that: at least one radical R is not hydrogen in the event R1 , R2 , R4 , R5 represent H, R3 is not nitro or cyano, and in the event R1 represents C1 or R1 and R3 represent C1, at least one of the remaining radicals is not hydrogen.
