Ammonium quercetin-5′-sulfonate form­amide solvate

The ammonium salt of 2,3-di­hydroxy-5-(3,5,7-tri­hydroxy-4-oxo-4H-1-benzo­pyran-2-yl)­benzene­sulfonic acid (common name quercetin-5′-sulfonate), NH₄⁺·C₁₅H₉O₁₀S⁻·CH₃NO, crystallizes as the form­amide solvate. The presence of the sulfonate group on the flavonoid core increases the solubility of this compound in water. In the solid state, anion–anion, anion–cation and anion–solvent–cation assemblies are formed by numerous intermolecular hydrogen bonds.