1-[2-(Di­carboxy­methyl)-3-oxo­cyclo­pent-4-en-1-yl]­pyrrolidin-1-ium bromide hydrate

Crystallization of 6-hydroxy-2,2-di­methyl-5-[2-oxo-5-(pyrrolidin-1-yl)­cyclo­pent-3-en-1-yl]-4H-1,3-dioxin-4-one from aqueous hydro­bromic acid gave the title compound, C₁₂H₁₆BrNO₅·H₂O. The crystal structure is stabilized by a three-dimensional network of hydrogen bonds.