Pyridinecarboxylic acids

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A pyridinecarboxylic acid is any member of a group of organic compounds which are monocarboxylic derivatives of pyridine. Pyridinecarboxylic acid comes in three isomers:

Common Name Picolinic acid Nicotinic acid/Niacin Isonicotinic acid
Systematic Name 2-pyridinecarboxylic acid 3-pyridinecarboxylic acid 4-pyridinecarboxylic acid
Structural Formula
CAS Registry Number 98-98-6 59-67-6 55-22-1

All isomers share the molecular weight 123,11 g/mol and the chemical formula C6H5NO2.