Naphthoic acid is a chemical compound that is commonly used in the manufacture of various chemicals, dyes and pharmaceuticals. It is an aromatic carboxylic acid that has a naphthalene ring structure and is soluble in ethanol, ether, and benzene. The term naphthoic acid can also be referred to as naphthalene-2-carboxylic acid or 2-naphthoic acid. It is also known by various other synonyms such as β-naphthoic acid, 2-carboxynaphthalene, and 2-naphthalencarboxylic acid. These synonyms are used interchangeably in the scientific and industrial world to refer to the same chemical compound.