(3S,4R)-3-Ethyl-4-hydroxy-3-(3-methoxyphenyl)-1-methylazepanium (2R,3R)-2,3-bis(benzoyloxy)-3-carboxypropionate

The crystal structure of the title compound, C16H26NO2 +·C18H13O8 −, is stabilized by an extensive network of classical N—H⋯O and O—H⋯O hydrogen bonding. The crystal structure also shows an ammonium-driven diastereoisomerism.