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9,9,10,10-Tetrafluoro-1,3,5,7-tetrathio-2,4,6,8-tetraaoxa-1,3,5,7-tetraphosphatricyclo[3.3.1.1^3,7^]decane, P~4~O~4~(CF~2~)~2~S~4~: a cage structure related to P~4~O~6~, Acta Crystallographica Section C 49, 1810 (1993)