title: 3,5-Dicarb-oxy-2,6-dimethyl-pyridinium chloride dihydrate.
abstract: In the title compound, C(9)H(10)NO(4) (+)·Cl(-)·2H(2)O, both the cation and the anion have crystallographic twofold rotation symmetry; in the former, one N and one C atom lie on the rotation axis. In the crystal structure, the ions and water mol-ecules are linked via O-H⋯O, O-H⋯Cl and N-H⋯Cl hydrogen bonds into layers parallel to (101).
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical, Engineering, Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: Ji-Yuan
authors.initials: JY
authors.lastname: Yao