数据之源，洞见之始

A pyridinemonocarboxylate resulting from the deprotonation of the carboxy group of 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic acid. The major species at pH 7.3." []

A monocarboxylic acid anion resulting from the removal of a proton from the carboxy group of (4-nitrophenyl)acetic acid; it is the major species at pH 7.3." []

A phenolate anion that is the conjugate base of 4-hydroxy-3-nitrophenylacetaldehyde; major species at pH 7.3" []

A univalent carboacyl group formed by loss of OH from the carboxy group of (4-hydroxy-3-nitrophenyl)acetic acid." []