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, Canadian Journal of Chemistry called Thermodynamics of protonation of weak bases in sulfuric acid-water media, determined using the excess acidity method, Author is Cox, Robin A.; Yates, Keith, which mentions a compound: 14248-66-9, SMILESS is O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-], Molecular C7H8N2O3, HPLC of Formula: 14248-66-9.
The excess acidity method was used to investigate the thermodn. of the protonation process for those weak bases for which the ionization ratios (or optical densities) at several temperatures were measured in aqueous H2SO4. Standard enthalpies and entropies, at 25° in the aqueous reference state, are given for 13 primary, 1 secondary, and 2 tertiary nitroanilines, 3 cyclocompds., 13 triphenylmethanols, 3 other carbocation precursors, 2 ketones, 9 pyridines, and 9 azine N-oxides. Guidelines for estimating pKBH+ at any temperature for other weak bases are discussed.
Although many compounds look similar to this compound(14248-66-9)HPLC of Formula: 14248-66-9, numerous studies have shown that this compound(SMILES:O=[N+](C1=C(C)C=[N+]([O-])C=C1C)[O-]), has unique advantages. If you want to know more about similar compounds, you can read my other articles.
Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem