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 Inhibition of growth and increased mortality of Mexican bean beetle larvae fed with thiamine and pyridoxine antagonists and reversal of effect with vitamin supplementation, published in 1968, which mentions a compound: 148-51-6, Name is 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, Molecular C8H12ClNO2, Computed Properties of C8H12ClNO2.
Repressed growth and survival of Mexican bean beetle (Epilachna varivestis) larvae were observed when the larvae were fed leaves dipped in 1% solutions of the vitamin analogs oxythiamine, pyrithiamine, or deoxypyridoxine. When the corresponding vitamins, thiamine or pyridoxine, were added to the antivitamins in a 1:1 ratio, the adverse effects of the antivitamins were reversed. Sulfanilamide and pantoyltaurine also increased mortality when used as 1% solutions, but pantothenyl alc., 2-picolinic acid, and 3-acetylpyridine were ineffective.
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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia