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A novel macrocyclic complex 2{[(n-Bu2Sn)4O2·L2]2·DMF} was synthesized by the reaction of 4-(1,2-dithioethylene)methylene-3,5-disoxo-1,6-heptadiene-1,7-dis-(o-formyl)-dis-p-phenoxyacetic acid(LH2, compound 1) with di-n-butyltin oxide. Compound 1