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In the title compound, C12H11N2+·I−, the aromatic rings are oriented at a dihedral angle of 73.40 (3)°. In the crystal structure, π–π contacts between the pyridine rings and the benzene and pyridine rings [centroid–centroid distances = 3.548 (3) and 4.211 (3) Å] may stabilize the structure.

The title compound, C12H13NO3, was prepared by the nucleophilic substitution reaction of acryloyl chloride with glycylglycine. In the crystal structure, intermolecular N—H...O, O–H...O and C—H...O hydrogen bonds link the molecules into a three-dimensional network.

The asymmetric unit of the title compound, C15H24O4, contains one half-molecule; a twofold rotation axis passes through the central C atom. The non-planar six- and five-membered rings adopt chair and envelope conformations, respectively. In the crystal structure, intermolecular C—H...O hydrogen bonds link the molecules.