2I2: (7~{S},13~{S})-1,1,3,3,5,5,9,9,11,11-decakis($l^{1}-oxidanyl)-8,10,14,15,16,17,18-heptaoxa-2,4,6,12-tetraoxonia-7$l^{5},13$l^{5}-diphospha-1$l^{6},3$l^{6},5$l^{6},9$l^{6},11$l^{6}-pentatungstanonacyclo[7.5.1.1^{1,3}.1^{3,5}.1^{5,11}.0^{2,7}.0^{4,13}.0^{6,11}.0^{9,12}]octadecane 7,13-dioxide