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 Computer program for calculating the nuclear magnetic double resonance spectrum, published in 1974, which mentions a compound: 616-43-3, Name is 3-Methyl-1H-pyrrole, Molecular C5H7N, Computed Properties of C5H7N.
A computer program for simulating a NMR spectrum was developed based on the theory which takes the mixing of energy levels by the irradiating radio-frequency field into account. The program is applicable to all types of spin systems up to 6 spins with I = 1/2. It was successfully applied to the calculation of the double resonance spectrum of the N-H proton of 3-methylpyrrole.
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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate