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2,4-Pyridinedicarboxylic acid, 2-Methyl ester Dimethyl 2,4-pyridinedicarboxylate 2,4-PYRIDINECARBOXYLIC ACID, 4-METHYL ESTER 2,4-Pyridinedicarboxylic acid PYRIDINE-3,4-DICARBOXYLIC ANHYDRIDE Bispyrithione 3,5-DIMETHOXYPYRIDINE-4-CARBOXALDEHYDE 3,5-Dimethoxypyridine 2,6-Dichloro-5-fluoro-3-pyridinecarbonitrile 6,6'-Dihydroxy-3,3'-bipyridine