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

[(E)-(3-methylthiophen-2-yl)methylideneamino]urea

Hydrazinecarboxamide, 2,2'-(2,6-pyridinediyldiethylidyne)bis-

2-甲基丙醛缩氨基脲

Acetoacetic acid, ethyl ester, semicarbazone