alpha-酮戊二酸

甲基肼

1-methyl-6-oxo-1,4,5,6-tetrahydro-pyridazine-3-carboxylic acid methyl ester

6-氧-1,4,5,6-四氢吡哒嗪-3-羧酸

methyl 6-oxo-1,4,5,6-tetrahydropyridazine-3-carboxylate