diethyl hydrazinedicarboxylate

1,4-二氯丁烷

1,2,3,6-tetrahydropyridazine-1,2-dicarboxylic acid dibenzyl ester

dimethyl 3,4,5,6-tetrahydropyridazine-1,2-dicarboxylate

diethyl diazinane-1,2-dicarboxylate