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The asymmetric unit of the title compound, C 5 H 8 O 6 S 2 , consists of two spiro­[5.5]undecane mol­ecules. The nonplanar six-membered rings adopt chair conformations. In the crystal structure, weak inter­molecular C—H⋯O inter­actions, together with close O⋯S contacts in the range 3.308 (3)–3.315 (3) Å, stabilize the packing.

2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane 3,9-dioxide