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The title compound, C17H29NO4, contains a chiral center and crystallizes as a racemate. The asymmetric unit consists of two non-equivalent mol­ecules, in which the carbeth­oxy groups have markedly different orientations [C(=O)CC(OEt)=O torsion angles = 59.3 (2) and 156.0 (2)°]. In the crystal, mol­ecules form chains along [101] through N—H...O hydrogen bonds.

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In the title mol­ecular salt, C6H9N2+·C7H4NO4, the original pyridine N atom of 2-amino-4-methyl­pyridine is protonated and the carb­oxylic acid group of nitro­benzoic acid is deprotonated. In the crystal, the ions are linked by N—H...O hydrogen bonds, forming chains propagating along [001]. The chains are linked via C—H...O hydrogen bonds, forming two-dimensional networks lying parallel to the bc plane.
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