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 Unusual blue-shifted acid-responsive photoluminescence behavior in 6-amino-8-cyanobenzo[1,2-b]indolizines, published in 2016, which mentions a compound: 21778-81-4, Name is 5-Methoxy-1H-indole-2-carbaldehyde, Molecular C10H9NO2, Product Details of 21778-81-4.
6-Amino-8-cyanobenzo[1,2-b]indolizines, a new class of photoluminescent materials, exhibit reversible pH-dependent optical properties characterized by an uncommon and dramatic blue shift in fluorescence emission when protonated. Acid titration and NMR spectroscopy experiments reveal that, rather than the anticipated N-protonation, C-protonation and loss of aromaticity is responsible for the observed photophys. changes. Efficient synthesis from indole-2-carboxaldehydes makes variously substituted versions of this nucleus readily available to tune optical and pH effects.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem