4-Methylhippuric Acid

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Organic Chemical

**Definition:** An isoform of methylhippuric acid where the methyl and glycine groups are bound to carbon-1 and carbon-4 on the benzene ring, respectively. Since 4-methylhippuric acid (4-MHA) is a metabolite of p-xylene, the measurement of 4-MHA in urine may be correlated to a subject's level of xylene exposure.

**Synonyms:** - 4-METHYLHIPPURIC ACID - 4-MHA - Glycine, N-(4-Methylbenzoyl)- (9CI) - Hippuric Acid, p-Methyl- (8CI) - N-(4-Methylbenzoyl)Glycine - N-(p-Toluoyl)Glycine - p-Methylhippuric Acid - p-Toluric Acid - para-Methylhippuric Acid