[(4-butoxyphenyl)methylideneamino]urea

[(Z)-[(2Z)-2-(carbamoylhydrazinylidene)ethylidene]amino]urea

[(Z)-octan-2-ylideneamino]urea

[(Z)-(2-cyclopentylidenecyclopentylidene)amino]urea

[1-(4-methylphenyl)ethylideneamino]urea