SEARCH Articles Figures Tables 1 -Phenyl-1 -hydroxy-3-methyl urea 1- Methyl-3- -urea sulfone Chloride methyl urea O-Methyl-N-p-toluene sulfonyl urea Urea 1-methyl-1-nitroso Urea 3-methyl-1,1-diphenyl Urea, 1-methyl-1- -2thio