1,4-diphenylpiperazine-2,5-dione

diethyl 2-[1-(4-nitrophenyl)ethyl]propanedioate

N,N'-dimethyl-N,N'-diphenylpropanediamide

ethyl 2-ethoxy-4-oxofuran-3-carboxylate

6-羟基-2-(羟基甲基)-4(3h)-嘧啶酮