Bis(3-methyl-piperidinium) naphthalene-1,5-disulfonate.
The asymmetric unit of the title compound, 2C(6)H(14)N(+)·C(10)H(6)O(6)S(2) (2-), contains one 3-methyl-piperidinium cation and one-half of the centrosymmetric naphthalene-1,5-disulfonate anion. In the crystal, anions and cations are linked through N-H⋯O hydrogen bonds into layers parallel to (101).
Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189,  People's Republic of China.
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