ChemInform Abstract: Synthesis of Pyridine-Containing Tetra-Aza Macrocycles: 3,7,11,17-Tetraazabicyclo(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) C

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