3-甲基-3-吡唑啉-5-酮

3,5-二甲基-1H-4-吡唑羧酸乙酯

[(Z)-1-(2-methoxyphenyl)ethylideneamino]urea

[1-(4-aminophenyl)ethylideneamino]urea

[1-(6-oxocyclohexa-2,4-dien-1-ylidene)ethylamino]urea