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 Synthesis and biological evaluation of indoles, published in 2015, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Computed Properties of C10H9NO2.
Objective of this research was to synthesize and characterize indole derivatives Indole nucleus has antimicrobial activities. Different kind of indole ring derivatives were synthesized such as 3-((E)-2-nitrovinyl)-1H-indole, 2-(1H-indol-3-yl)ethanamine, N-(2-(1H-indol-3-yl)ethyl)benzamide, Me 2-(3-(2-(benzamido)ethyl)-1H-indol-1-yl)acetate, 2-(3-(2-(benzamido)ethyl)-1H-indol-1-yl)acetic acid, N-(2-(1-((2,3-dihydro-1H-inden-5-yl-carbamoyl)methyl)-1H-indol-3-yl)ethyl)benzamide, e.g., I [R = 4-indanyl, 5-indanyl]. Antifungal activity of compounds I [R = 4-indanyl, 5-indanyl] were also studied.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem