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 Nitroimidazoles. VI. Partition coefficients and tautomerism of simple nitroimidazoles, published in 1985, which mentions a compound: 4531-54-8, Name is 1-Methyl-4-nitro-1H-imidazol-5-amine, Molecular C4H6N4O2, Product Details of 4531-54-8.
Octanol-water partition coefficients (P) were determined for 42 simple nitroimidazoles with Me, Cl, Br, MeO, NH2, and NO2 substituents. Correlation between log P and the substituent constants πX of Hansch and fX of Nys-Rekker was derived. For the N-methylated compounds, the average value of πN-CH3 was calculated to be -0.30. Significance of log P measurement in estimating the tautomeric equilibrium in 4(5)-nitroimidazoles is discussed in detail.
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Reference:
Thiomorpholine – Wikipedia,
Thiomorpholine | C4H9NS – PubChem