An optically resolved crystal of thio­malate: (S)-1-phenyl­ethanaminium (R)-thio­malate

The asymmetric unit of the optically resolved title salt, C₈H₁₂N⁺·C₄H₅O₄S^-, contains a 1-phenyl­ethanaminium monocation and a thio­malate (3-carb­oxy-2-sulfanyl­propano­ate) monoanion. The absolute configurations of the cation and the anion are determined to be S and R, respectively. In the crystal, cation-anion N-H...O hydrogen bonds, together with anion-anion O-H...O and S-H...O hydrogen bonds, construct a two-dimensional supra­molecular sheet parallel to the ab plane. The two-dimensional sheet is linked with the upper and lower sheets through C-H...[pi] inter­actions to stack along the c axis.