5-甲氧基-6-甲基-3,4-吡啶二甲醇

ethyl 5-cyano-2-methyl-3-nitro-6-oxo-1H-pyridine-4-carboxylate

5-amino-6-methylpyridine-3,4-dicarboxylic acid

5-(5-(乙氧基羰基)-3-甲基-1H-吡唑-1-基)-2-甲氧基苯甲酸