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 Modification of Monocarboxylic Acid Hydrazides with Tropylium Salts, published in 2019-12-31, which mentions a compound: 3326-71-4, Name is 2-Furoic hydrazide, Molecular C5H6N2O2, Recommanded Product: 3326-71-4.
Nicotinic, isonicotinic, and furan-2-carboxylic acid hydrazides reacted with 2 equiv of tropylium perchlorate or tetrafluoroborate to give the corresponding N’N’-di(cyclohepta-2,4,6-trein-1-yl) derivatives as a result of electrophilic substitution of both hydrogen atoms in the primary amino group. The reaction of furan-2-carbohydrazide with an equimolar amount of tropylium salt gave N’-(cyclohepta-2,4,6-trien-1-yl)furan-2-carbohydrazide.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics