Bis(butan-1-aminium) naphthalene-1,5-disulfonate.
In the title compound, 2C(4)H(12)N(+)·C(10)H(6)O(6)S(2) (2-), the anion lies on an inversion center, so the asymmetric unit contains half an anion and one cation which are linked by a strong N-H⋯O hydrogen bond. The crystal structure comprises discrete ions, which are linked into centrosymmetric R(4) (4)(12) loops by N-H⋯O inter-actions.
Ordered Matter Science Research Center, Southeast University, Nanjing 211189,  People's Republic of China.
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