Synonyms: N,N′-Bis(4-nitrophenyl)urea compd. with 4,6-dimethyl-2-pyrimidinol (1:1);Urea, N,N′-bis(4-nitrophenyl)-, compd. with 4,6-dimethyl-2(1h)-pyrimidinone (1:1) (9Cl);1,3-Bis(4-nitrophenyl)urea--4,6-dimethylpyrimidin-2-ol (1:1);Nicoxin;Urea, N,N-bis(4-nitrophenyl)-, compd. with 4, 6-dimethyl-2(1H)-pyrimidinone (1:1);4, 4-Dinitrocarbanilide, 4,6-dimethyl-2-pyrimidinol;MK 75;Nirazin;1,3-Bis(4-nitrophenyl)urea; 4,6-dimethyl-1H-pyrimidin-2-one;