Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Tetrahedron called Heteroaromaticity. 8. The influence of N-oxide formation on heterocyclic aromaticity, Author is Bird, Clive W., which mentions a compound: 14248-66-9, SMILESS is O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-], Molecular C7H8N2O3, Computed Properties of C7H8N2O3.
A recently described aromaticity index(author, 1992) has been used to examine the changes in the aromaticity of nitrogen heterocycles that accompany their N-oxidation Some instances are noted where there is an unforeseen increase in aromatic character. The aromaticity indexes is isomeric furoxans can be a useful indication as to their relative stabilities.
In addition to the literature in the link below, there is a lot of literature about this compound(3,5-Dimethyl-4-nitropyridine 1-oxide)Computed Properties of C7H8N2O3, illustrating the importance and wide applicability of this compound(14248-66-9).
Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem