Crystal structure of (1S,2R)-2-hy­droxy-1,2-di­phenyl­ethan-1-aminium (S)-2-aza­niumyl­butane­dioate monohydrate

The title diastereomeric salt, formed between 2-amino-1,2-di­phenyl­ethanol (ADE) and aspartic acid (ASP), C(14)H(16)NO(+)·C(4)H(6)NO(4) (−)·H(2)O, crystallizes as a monohydrate. The 1,2-di­phenyl­ethyl group in the cation has a cis conformation, and the aspartic acid anion is in the zwitterionic form. In the crystal, the ASP anions are linked via N—H⋯O hydrogen bonds to form a 2(1) helix along the b-axis direction. The helices are linked by the ADE cations via O—H⋯O and N—H⋯O hydrogen bonds, forming layers parallel to the bc plane. There are channels in the layers that are occupied by water mol­ecules, which link to both the anions and cations via O(water)—H⋯O and N—H⋯O(water) hydrogen bonds. There are also C—H⋯O and C—H⋯π inter­actions present within the layers.