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 New reagent for vitamin B6 derivative formation in gas chromatography, published in 1977, which mentions a compound: 148-51-6, Name is 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, Molecular C8H12ClNO2, Name: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride.
Gas-chromatog. separation of 4 vitamin B6 derivatives consisted of converting them into hemiacetals with EtOH, refluxing at 125° for 15 min, evaporating the excess EtOH at 70° under N, and adding the new reagent N-methylbistrifluoroacetamide [685-27-8], followed by refluxing at 125° for 20 min and injecting the samples onto a column packed with 5% silicone oil on Chromosorb P and using flame ionization detection. The compounds derivatized were pyridoxine-HCl (I) [58-56-0], pyridoxamine-di-HCl [524-36-7], deoxypyridoxine-HCl [148-51-6] and pyridoxal-HCl [65-22-5]. The min. detectable amount is ∼250 ng. The procedure is rapid, clean, and simple.
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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia