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 Probing the B- & C-rings of the antimalarial tetrahydro-β-carboline MMV008138 for steric and conformational constraints, published in 2020-11-15, which mentions a compound: 7524-52-9, Name is H-Trp-OMe.HCl, Molecular C12H15ClN2O2, Computed Properties of C12H15ClN2O2.
The antimalarial candidate MMV008138 (1a, I, (1R,3S) active isomer shown) is of particular interest because its target enzyme (IspD) is absent in human. To achieve higher potency, and to probe for steric demand, a series of analogs of 1a were prepared that featured methyl-substitution of the B- and C-rings, as well as ring-chain transformations. X-ray crystallog., NMR spectroscopy and calculation were used to study the effects of these modifications on the conformation of the C-ring and orientation of the D-ring. Unfortunately, all the B- and C-ring analogs explored lost in vitro antimalarial activity. The possible role of steric effects and conformational changes on target engagement are discussed.
In addition to the literature in the link below, there is a lot of literature about this compound(H-Trp-OMe.HCl)Computed Properties of C12H15ClN2O2, illustrating the importance and wide applicability of this compound(7524-52-9).
Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem