ethyl 5-oxo-1-phenyl-2-sulfanylideneimidazolidine-4-carboxylate

Benzamidomalonic acid, diethyl ester

ethyl 4-(2-methoxy-2-oxoethyl)-3,5-dimethyl-1H-pyrrole-2-carboxylate

二乙基脲基丙二酸酯

5-乙氧基-2-苯基-1,3-恶唑-4-羧酸