[[2-(carbamoylhydrazinylidene)-1,2-diphenylethylidene]amino]urea

Acetoacetic acid, ethyl ester, semicarbazone

[(3,5-dimethoxy-4-oxocyclohexa-2,5-dien-1-ylidene)methylamino]urea

(heptylideneamino)urea

(hexylideneamino)urea