1-(4-chloropyridin-2-yl)-1-cyclohexyl-3-(4-nitrophenyl)urea

1-methyl-3-(4-nitrophenyl)-1-phenylurea

1-(4-nitrophenyl)-3-octylurea

hexyl N-(4-nitrophenyl)carbamate

1-(4-nitrophenyl)-3-(1,3-thiazol-2-yl)urea