Email zadetek: Bis[1,2-bis­(meth­oxy­carbon­yl)ethene-1,2-dithiol­ato-κ(2) S,S′]bis­(η(5)-penta­methyl­cyclo­penta­dien­yl)tetra-μ(3)-sulfido-tetra­iron(4 Fe–Fe) hexa­fluoridophosphate