In the title compound, C4H9N2O3
+·NO3
−, alternatively called (1RS)-2-carbamoyl-1-carboxyethanaminium nitrate, the asymmetric unit comprises one asparaginium cation and one nitrate anion. The strongest cation–cation O—H⋯O hydrogen bond in the structure, together with other strong cation–cation N—H⋯O hydrogen bonds, generates a succession of infinite chains of R
2
2(8) rings along the b axis. Additional cation–cation C—H⋯O hydrogen bonds link these chains into two-dimensional layers formed by alternating R
4
4(24) and R
4
2(12) rings. Connections between these layers are provided by the strong cation–anion N—H⋯O hydrogen bonds, as well as by one weak C—H⋯O interaction, thus forming a three-dimensional network. Some of the cation–anion N—H⋯O hydrogen bonds are bifurcated of the type D—H⋯(A
1,A
2).
In the title compound, C15H12N2O3S, there are two molecules (A and B) in the asymmetric unit. The attached phenol and quinoline moieties of each molecule are almost coplanar with a dihedral angle of 6.05 (15)° for molecule A and 1.89 (13)° for molecule B. The crystal structure features N—H...O and C—H...O hydrogen bonds, C—H...π interactions and π–π stacking interactions. Hirshfeld surface analysis indicates that the most significant contacts in the crystal packing are C...H/H...C (29.2%), O...H/H...O (28.6%) and H...H (28.5%).
In the title molecular salt, C6H8NO+·C2H3O2
−, the cations and anions are linked by O—H...O and N—H...O hydrogen bonds, generating a three-dimensional network.
In the orthorhombic crystal form, the molecules are linked by weak C—H⋯O hydrogen bonds into supramolecular chains propagating along the b-axis direction.
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