Pyridinecarboxylic Acids

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

• Picolinic acid (2-pyridinecarboxylic acid)
• Nicotinic acid (3-pyridinecarboxylic acid), also known as Niacin
• Isonicotinic acid (4-pyridinecarboxylic acid)

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.

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