1 Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China.
The complete molecule of the title compound, C(10)H(10)O(4)S(2), is generated by a crystallographic inversion centre. In the crystal, mol-ecules are linked into a one-dimensional chain by inter-molecular O-H⋯O hydrogen bonds.