5-amino-6-methyl-pyridine-3,4-dicarboxylic acid dimethyl ester

3-amino-6-chloro-2-methylpyridin-4,5-dicarboxylic acid

(5-hydroxy-4-(hydroxymethyl)-6-methylpyridin-3-yl)methyl acetate

3-羟基-5-羟甲基-4-甲氧甲基-2-甲基吡啶