52049-26-0 NSC 239724 NSC240024 Urea, 1-(2-chloroethyl)-3-(cis-4-hydroxycyclohexyl)-1-nitroso- Urea, N-(2-chloroethyl)-N'-(4-hydroxycyclohexyl)-N-nitroso-, cis- cis-4-Hydroxy CCNU cis-4-OH CCNU