1-Carboxylato­methyl-2-(hydroxy­quinolin-4-yl­methyl)-5-vinyl-1-azoniabi­cyclo­[2.2.2]­octane, a zwitterion of the Cinchona alkaloid complex

The title compound, C₂₁H₂₄N₂O₃, is a zwitterion of the Cinchona alkaloid complex. In the crystal structure, intermolecular O—H...O and C—H...O hydrogen bonds link the mol­ecules into one-dimensional double-stranded ladders. The crystal packing is further stabilized by van der Waals forces.