164120-30-3 7-beta-(2-Chloroethyl-N-nitroso-N-carbonylamino)cholesterol N-(2-Chloroethyl)-N'-((3-beta,7-beta)-3-hydroxycholest-5-en-7-yl)-N-nitrosourea Urea, N-(2-chloroethyl)-N'-((3-beta,7-beta)-3-hydroxycholest-5-en-7-yl)-N-nitroso-