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Chemical structures of the inverse copper(II) compounds with oxalato as centroligand and pyrazole and its polymethyl-substituted derivatives as terminal ligands: triangular-based branch-type chain and hexanuclear compounds (1 and 2), asymmetric zig-zag chains (4), symmetric dinuclear complexes (5a/5b), and rectangular-based alternating sheet-like compounds (6). The Werner-type mononuclear complex (3) has been included for completeness.
