1:1 Cocrystal of (S)-3-(ammoniomethyl)-5-methylhexanoate and (S)-mandelic acid

The title compound, C8H17NO2·C8H8O3, exists as a complex with the base (pregabalin) in the predicted zwitterion form, based on the pKa differences between the acid and base. The asymmetric unit consists of two molecules of each component. The –NH3 group adopts the standard propeller conformation. The structure forms pairs of hydro­phobic and hydro­philic inter­actions along both the a and c axes.