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.