ethyl N-(2,4-dioxopentan-3-yl)-N-(ethoxycarbonylamino)carbamate

2-苯基乙基碳酸乙酯

diethyl 1-phenethylhydrazine-1,2-dicarboxylate

diethyl 3,4-dihydropyrido[3,4-c]pyridazine-1,2-dicarboxylate

ethyl 2-cyclohexyloxyimino-3-oxobutanoate