ethyl 2-[(2-ethoxy-2-oxoethyl)carbamoylamino]acetate

2-(2,5-二氧代咪唑烷-1-基)乙酸乙酯

2,5-恶唑烷二酮

ureylenedi-malonic acid tetraethyl ester

N,N'-bis(carboxymethyl)urea