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 Spin-echo method for measuring relaxation times in twoline NMR [nuclear magnetic resonance] spectra, published in 1961, which mentions a compound: 600-05-5, Name is 2,3-Dibromopropionic acid, Molecular C3H4Br2O2, Recommanded Product: 600-05-5.
cf. Meiboom and Gill, CA 54, 16196a. A scheme is presented for separating spin-echo measurements of the individual lines in a 2-line spectrum by adjusting the radio-frequency (rf) amplitudes in the pulses so that the magnetization vector associated with the 2nd line returned to its original direction at the end of the pulse. Relatively strong rf amplitudes, which perturbed the 2nd magnetization considerably while the pulse was on, could thus be used. A modified Carr-Purcell spin-echo measurement of T2 of the Me line in MeOH is illustrated. The technique described was useful when the NMR spectrum was due to chem. shifts and the ratio of line width to line separation was relatively large.
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Reference:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem