Crystal structure of {μ2-1,2-bis[(4-methylphenylsulfanyl]-3-oxoprop-1-ene-1,3-diyl-1:2κ2 C 3:C 1}dicarbonyl-1κ2 C-[μ2-methylenebis(diphenylphosphane)-1:2κ2 P:P′](triphenylphosphane-2κP)ironplatinum(Fe—Pt), [(OC)2Fe(μ-dppm){μ-C(=O)C(4-MeC6H4SCH2)=CCH2SC6H4Me-4}Pt(PPh3)]