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In the title compound, C(11)H(12)N(2)O(2)·C(7)H(5)NO(4)·C(2)H(6)O, the (2S*)-2-amino-3-(1H-indol-3-yl)propionic acid is present in the zwitterionic form. In the crystal structure, 2-amino-3-(1H-indol-3-yl)propionic acid mol-ecules and pyridine-2,4-dicarb-oxylic acid mol-ecules are linked through strong inter-molecular O-H⋯O and N-H⋯O hydrogen bonds, forming layers parallel to (100). The layers are linked through the ethanol mol-ecules via somewhat weaker inter-molecular O-H⋯O and N-H⋯O hydrogen bonds, forming thus a three-dimensional network. Weak C-H⋯O and N-H⋯N hydrogen bonding and π-π inter-actions between the aromatic rings are also present.

(2S*)-2-Ammonio-3-(1H-indol-3-yl)propionate pyridine-2,4-dicarboxylic acid ethanol solvate