Synthesis of pyridine-containing tetra-aza macrocycles: 3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17),13,15-triene (L1), its 3,11-dibenzyl (L2) and 3,7,11-tribenzyl (L3) derivatives, and their nickel(II), copper(II), and zinc(II) complexes: crystal structures of L2�HCL and [Ni(L2)Cl]ClO4�H2O

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