56239-24-8 NSC 239717 NSC240025 Urea, 1-(2-chloroethyl)-3-(trans-4-hydroxycyclohexyl)-1-nitroso- Urea, N-(2-chloroethyl)-N'-(4-hydroxycyclohexyl)-N-nitroso-, trans- trans-4-Hydroxy CCNU trans-4-OH CCNU