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Pterine-6-carboxylic Acid is a degradation product of Folic acid (F680300).

ChEBI: 2-Amino-4-hydroxy-6-pteridinecarboxylic acid is an organooxygen compound and an organonitrogen compound. It is functionally related to an alpha-amino acid.

The acid gives yellow crystals by repeated dissolution in aqueous NaOH and adding aqueous HCl. It has UV with max at 235, 260 and 265nm ( 11,000, 10,500 and 9,000) in 0.1N HCl and 263 and 365nm ( 20,500 and 9,000) in 0.1N NaOH. [UV: Pfleiderer et al. Justus Liebigs Ann Chem 741 64 1970, Stockstad et al. J Am Chem Soc 70 5 1948, Fluorescence: Kavanagh & Goodwin Arch Biochem 20 315 1949, Beilstein 26 III/IV 4053.]