Fumaric acid, also known as trans-butenedioic acid, is a chemical compound commonly used in the food and pharmaceutical industry. However, there are different names for this compound depending on its application. In the food industry, fumaric acid is sometimes referred to as E297 or food acidulant. For pharmaceutical use, it is called allomaleic acid or trans-2-butenedioic acid. There are also other synonyms for fumaric acid, such as 1,2-Ethylenedicarboxylic acid, boletic acid, and Lichenic acid. Despite having different names, these synonyms refer to the same chemical formula C4H4O4 and are used interchangeably depending on the industry and context.