3-Hydroxyanthranilic acid also known as 2-amino-3-hydroxy-benzoate or 3-ohaa belongs to the class of organic compounds known as hydroxybenzoic acid derivatives. 3-Hydroxyanthranilic acid has been found in human epidermis and bladder tissues and has also been detected in multiple biofluids such as urine and blood.

2-Phenylglycine is a metabolite in breast milk during the lactation period.

Methylglutaric acid is a leucine metabolite. A large amount of methylglutaric acid is identified in urine of patients with deficiency of 3-methylglutaconyl coenzyme A hydratase. Methylglutaric acid is also found to be associated with 3-hydroxy-3-methylglutaryl-CoA lyase deficiency another inborn error of metabolism.