1-Methyl-1-nitroso-3-(p-tolyl)urea 23139-00-6 BRN 2939628 N-Methyl-N'-(4-methylphenyl)-N-nitrosourea N-Methyl-N'-(p-methylphenyl)-N-nitrosourea NSC 114147 Urea, 1-methyl-1-nitroso-3-(p-tolyl)-