methyl N-[(4-oxocyclohexa-2,5-dien-1-ylidene)methylamino]carbamate

5-(2-HYDROXYBENZYLIDENE)-2-THIOHYDANTOIN

N-(硫代氨基甲酰)甘氨酸

5-isopropylidene-2-thioxo-imidazolidin-4-one