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Representation of three 12-MC-4 type manganese(III) metallacrowns with: (a) MnII and acetates as bridges (Lah & Pecoraro 1989), (b) two NaI and two bromide bridges (Gibney et al. 1996) and (c) DyIII and four salicylate bridges. We expect the Ca 12-MC-4 to be isostructural with the structure with MnII (a).
