3d image of 5-hydroxyindoleacetic acid skeletal formula

5-hydroxyindoleacetic acid 5-hiaa serotonin structure molecular crystalline amino butyric tryptophan dopamine tryptamine chemistry biogenesis pharmacological formation pure dissociation enzyme physiological barbituric uridylic benzodiazepine receptor test range urine carcinoid tumor malabsorption 3d rendering chemical biochemistry molecule structural formula metabolite metabolism biosynthesis mechanism pathway biosynthetic intermediate substrate precursor synthesis derivative metabolic