Methylene hippuric acid is a compound found in urine that is used to assess occupational exposure to toluene, a common solvent. The term "methylene hippuric acid" is a specific name for this chemical, but there are alternative synonyms to describe it as well. One common synonym for methylene hippuric acid is "methylhippuric acid" since it contains a methyl group. Another synonym is "toluene metabolite" which refers to its origin as a byproduct of toluene metabolism in the body. These synonyms serve as convenient alternatives when referring to this compound, making it more accessible for researchers and professionals in the field of occupational health and toxicology.