Gravar-mail: [μ-(3,4,5,6,7-η:1,9,10,11,12)-5,11-Di-tert-butyl-2,2,8,8-tetra­methyl-2,8-disila­tricyclo­[7.3.0.0(3,7)]dodeca­tetra­enedi­yl]bis­[dicarbonyl­ruthenium(I)]