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 The special features of the thermal oxidative destruction of isomeric dipyrrolylmethanes, published in 2006, which mentions a compound: 2199-44-2, Name is Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, Molecular C9H13NO2, SDS of cas: 2199-44-2.
3,3′,4,4′-Tetramethyl-5,5′-dicarbethoxydipyrrolylmethane-2,2′ and its α,β and β,β isomers were synthesized. The compounds were characterized by recording their proton NMR spectra. The thermal oxidative destruction of the compounds was studied thermogravimetrically. The results were used to determine the temperature and enthalpy characteristics of fusion and the temperatures of the beginning and maxima of the exothermic effects of the destruction of dipyrrolylmethanes in air oxygen. The thermal stability of dipyrrolylmethanes was found to be primarily determined by mol. isomerism and increase for sym. substituted α,α- and β,β-dipyrrolymethanes compared with the α,β isomer.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com