ethyl 2-cyano-3-(methylcarbamoylamino)prop-2-enoate

5,5-二苯基恶唑烷-2,4-二酮

5-ethyl-1-methyl-1,3-diazinane-2,4,6-trione

ethyl N-(methylcarbamoyl)carbamate

3-ethyl-1-methyl-1-phenylurea