| Compound | Description |
|---|
| diphosphoric acid | |
| Carbon Dioxide | A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals. |
| tryptophan | An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals. |
| phosphoribosyl pyrophosphate | The key substance in the biosynthesis of histidine, tryptophan, and purine and pyrimidine nucleotides. |
| Water | A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) |
| Oxygen | An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration. |
| quinolinic acid | A metabolite of tryptophan with a possible role in neurodegenerative disorders. Elevated CSF levels of quinolinic acid are correlated with the severity of neuropsychological deficits in patients who have AIDS. |
| 3-hydroxykynurenine, (L)-isomer | |
| formic acid | RN given refers to parent cpd |
| n'-formylkynurenine | a photochemical breakdown product of tryptophan in proteins; RN given refers to parent cpd without isomeric designation |
| 3-hydroxyanthranilic acid | An oxidation product of tryptophan metabolism. It may be a free radical scavenger and a carcinogen. |
| creolin | from refined coal tar oils |
| kynurenine | A metabolite of the essential amino acid tryptophan metabolized via the tryptophan-kynurenine pathway. |