3-(hydroxymethyl)pyridine-2-carboxylic acid

6-(2-hydroxyethyl)pyrrolo[3,4-b]pyridine-5,7-dione

甲基3-(氯甲酰基)-2-吡啶羧酸酯

spiro[7H-pyrano[4,3-b]pyridine-8,2'-oxirane]-5-one

4-hydroxy(pyridyl-3-carbomethoxy-2-carboxyl)-5-aza-3,4-isochromen-1-one