bis-N,N'-(4-nitrophenyl)urea, N,N'-bis-p-nitrophenylurea, N-(4-nitrophenyl)-N'-(4-nitrophenyl)urea, N,N'-Bis(4-nitrophenyl)urea, N,N'-Di(p-nitrophenyl)urea, Urea,N,N'-bis(4-nitrophenyl), N,N'-bis(4-nitrophenyl)thiourea, Urea, N,N‘-bis(4-nitrophenyl)-, 4,4'-Dinitrodiphenylurea, 4',4''-Dinitrocarbanilide, 4,4'-Dinitrocarbanilide