4-Pyridinecarboxylic acid, 2-(2-ethoxy-1-imino-2-oxoethyl)hydrazide

diethyl 1H-1,2,4-triazole-3,5-dicarboxylate

异烟酸

3,5-二甲基吡唑

3,4-二甲基-1,6-二氢吡喃并[2,3-C]吡唑-6-酮