20-Di­cyano­methyl­ene-5,8,11,14-tetraoxa-2,17-di­thia­bi­cyclo­[16.4.1]­tricosa-1(23),18,21-triene and its mercury(II) dichloride complex

The structures of the title compound, C₂₀H₂₄N₂O₄S₂, and its mercury(II) dichloride complex, dichloro{20-di­cyano­methyl­ene-5,8,11,14-tetraoxa-2,17-di­thia­bi­cyclo­[16.4.1]­tricosa-1(23),18,­21-tri­ene-κ⁴O,κS¹⁷}mercury(II), [HgCl₂(C₂₀­H₂₄­N₂­O₄­S₂)], have been determined by X-ray crystallographic analyses. The mercury(II) dichloride complex has two independent mol­ecules of [HgCl₂(C₂₀H₂₄N₂O₄S₂)] in the lattice. The mercury(II) ion has pentagonal bipyramidal coordination which involves one S atom, four O atoms and two Cl⁻ ions.