58494-42-1 NSC 406024 NSC406024 SRI 1454 Urea, 1-methyl-1-nitroso-3-(1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl)- Urea, N-methyl-N-nitroso-N'-(1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl)-