[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][Branch1][#Branch1][C][C][=Branch1][C][=O][O][O]"}, {"from": "gpt", "value": "The molecule is an organic acid detected in human urine. It is thought that the presence of this acid is from nutritional sources (i.e. dietary phenylalanine). However, there has been a considerable degree of ambiguity in the origin and/or significance of this compound (A15196). Recently it has been reported that HPHPA is actually an abnormal phenylalanine metabolite arising from bacterial metabolism in the gastrointestinal tract. Specifically HPHPA appears to arise from the action of the anaerobic bacteria Clostrida sp. (A15197). Elevated levels of HPHPA have been reported in the urine of children with autism as well as in adult patients with schizophrenia. It has been proposed that HPHPA may be a bacterial metabolite of m-tyrosine, a tyrosine analog that causes symptoms of autism in experimental animals."}]