In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Biological radiation protection. LIX. The meaning of radiation-caused changes in the content of metabolites to the survival rate of mice, published in 1964, which mentions a compound: 148-51-6, Name is 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, Molecular C8H12ClNO2, Recommanded Product: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride.
After radiation, changes occur in albumin metabolism, especially in the case of tryptophan and cysteine. The changes reflect a curbing of the activity of amino acid decarboxylase with pyridoxal 5-phosphate as coenzyme. The following compounds increased the mortality rate when given with an x-ray dose of 505 r. (L.D.16/30): 4-deoxypyridoxine-HCl, isonicotinic acid hydrazide,DL-tryptophan, DL-kynurenine, and L-kynurenine. Taurine, given with 590 r. (L.D.64/30), increased the survival rate.
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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia